Plutarch (2nd c. AD)  On Isis and Osiris (12-19, excerpted from http://penelope.uchicago.edu)

They say that the Sun, when he became aware of Rhea's intercourse with Cronus,59 invoked a curse upon her that she should not give birth to a child in any month or year; but Hermes, being enamoured of the goddess, consorted with her. Later, playing at draughts with the moon, he won from her the seventieth part of each of her periods of illumination,60 and from all the winnings he composed five days, and intercalated them as an addition to the three hundred and sixty days. eThe Egyptians even now call these five days intercalated61 and celebrate them as the birthdays of the gods. They relate that on the first of these days Osiris was born, and at the hour of his birth a voice issued forth saying, "The Lord of All advances to the light." But some relate that a certain Pamyles,62 while he was drawing water in Thebes, heard a voice issuing from the shrine of Zeus, which bade him proclaim with a loud voice that a mighty and beneficent king, Osiris, had been born; and for this Cronus entrusted to him the child Osiris, which he brought up. It is in his honour that the festival of Pamylia is celebrated, a festival which resembles the phallic processions. fOn the second of these days Arueris was born whom they call Apollo, and some call him also the elder Horus. On the third day Typhon was born, but not in due season or manner, but with a blow he broke through his mother's side and leapt forth. On the fourth day Isis was born in the regions that are ever moist;63 and on the fifth Nephthys, to whom they give the name of Finality64 and the name of Aphroditę, and some also the name of Victory. There is also a tradition that Osiris and Arueris were sprung from the Sun, Isis from Hermes,65 and Typhon and Nephthys from Cronus. For this reason the kings considered the third of the intercalated days as inauspicious, and transacted no business on that day, nor did they give any attention to their bodies until nightfall. They relate, moreover, that Nephthys became the wife of Typhon;66 but Isis and Osiris were enamoured of each other67 and consorted together in  the darkness of the womb before their birth. Some say that Arueris came from this union and was called the elder Horus by the Egyptians, but Apollo by the Greeks.

13 One of the first acts related of Osiris in his reign was to deliver the Egyptians from their destitute and brutish manner of living.68 This he did by showing them the fruits of cultivation, by giving them laws, and by teaching them to honour the gods. Later he travelled over the whole earth civilizing it69 without the slightest need of arms, but most of the peoples he won over to his way by the charm of his persuasive discourse combined with song and all manner of music. Hence the Greeks came to identify him with Dionysus.70

During his absence the tradition is that Typhon attempted nothing revolutionary because Isis, who was in control, was vigilant and alert; but when he returned home Typhon contrived a treacherous plot against him and formed a group of conspirators seventy-two in number.  Typhon, having secretly measured Osiris's body cand having made ready a beautiful chest of corresponding size artistically ornamented, caused it to be brought into the room where the festivity was in progress. The company was much pleased at the sight of it and admired it greatly, whereupon Typhon jestingly promised to present it to the man who should find the chest to be exactly his length when he lay down in it. They all tried it in turn, but no one fitted it; then Osiris got into it and  lay down, and those who were in the plot ran to it and slammed down the lid, which they fastened by nails from the outside and also by using molten lead. Then they carried the chest to the river and sent it on its way to the sea

14 The first to learn of the deed and to bring to men's knowledge an account of what had been done were the Pans and Satyrs who lived in the region around Chemmis,74 and so, even to this day, the sudden confusion and consternation of a crowd is called a panic.75 Isis, when the tidings reached her, at once cut off one of her tresses and put on a garment of mourning in a place where the city still bears the name of Kopto (= ‘cut’).76 Others think that the name means deprivation, for they also express "deprive" by means of "koptein."77 But Isis wandered everywhere at her wits' end; no one whom she approached did she fail to address, and even when she met some little children she asked them about the chest. As it happened, they had seen it, and they told her the mouth of the river through which the friends of Typhon had launched the coffin into the sea. Wherefore the Egyptians think that little children possess the power of prophecy,78 and they try to divine the future from the portents which they find in children's words, especially when children are playing about in holy places and crying out whatever chances to come into their minds.

They relate also that Isis, learning that Osiris in his love had consorted with her sister79 through ignorance, in the belief that she was Isis, and seeing the proof of this in the garland … which he had left with Nephthys, sought to find the child; for the mother, immediately after its birth, had exposed it because of her fear of Typhon. And when the child had been found, after great toil and trouble, with the help of dogs which led Isis to it, it was brought up and became her guardian and attendant, receiving the name of Anubis, and it is said to protect the gods just as dogs protect men.80

15 Thereafter Isis, as they relate, learned that the chest had been cast up by the sea near the land of Byblus81 and that the waves had gently set it down in the midst of a clump of heather. The heather in a short time ran up into a very beautiful and massive stock, and enfolded and embraced the chest with its growth and concealed it within its trunk. The king of the country admired the great size of the plant, and cut off the portion that enfolded the chest (which was now hidden from sight), and used it as a pillar to  support the roof of his house. These facts, they say, Isis ascertained by the divine inspiration of Rumour, and came to Byblus and sat down by a spring, all dejection and tears;82 she exchanged no word with anybody, save only that she welcomed the queen's maidservants and treated them with great amiability, plaiting their hair for them band imparting to their persons a wondrous fragrance from her own body. But when the queen observed her maidservants, a longing came upon her for the unknown woman and for such hairdressing and for a body fragrant with ambrosia. Thus it happened that Isis was sent for and became so intimate with the queen that the queen made her the nurse of her baby. They say that the king's name was Malcander; the queen's name some say was Astartę, others Saosis, and still others Nemanűs, which the Greeks would call Athenaďs.

16 1 They relate that Isis nursed the child by giving it her finger to suck instead of her breast, cand in the night she would burn away the mortal portions of its body. She herself would turn into a swallow and flit about the pillar with a wailing lament, until the queen who had been watching, when she saw her babe on fire, gave forth a loud cry and thus deprived it of immortality. Then the goddess disclosed herself and asked for the pillar which served to support the roof. She removed it with the greatest ease and cut away the wood of the heather which surrounded the chest; then, when she had wrapped up the wood in a linen cloth and had poured perfume upon it, she   entrusted it to the care of the kings; and even to this day the people of Byblus venerate this wood which is preserved in the shrine of Isis. Then the goddess threw herself down upon the coffin with such a dreadful wailing that the younger of the king's sons expired on the spot. The elder son she kept with her, and, having placed the coffin on board a boat, she put out from land. Since the Phaedrus river toward the early morning fostered a rather boisterous wind, the goddess grew angry and dried up its stream.

17 In the first place where she found seclusion, when she was quite by herself, they relate that she opened the chest and laid her face upon the face within and caressed it and wept. The child came quietly up behind her and saw what was there, and when the goddess became aware of his presence, she turned about and gave him one awful look of anger. eThe child could not endure the fright, and died. Others will not have it so, but assert that he fell overboard into the sea from the boat that was mentioned above.83 He also is the recipient of honours because of the goddess; for they say that the Maneros of whom the Egyptians sing at their convivial gatherings is this very child.84 Some say, however, that his name was Palaestinus or Pelusius, and that the city founded by the goddess was named in his honour. They also recount that this Maneros who is the theme of their songs was the first to invent music. But some say that the word is not the name of any person, but an expression belonging to the vocabulary of drinking and feasting: "Good luck be ours in things like this!", fand that this is really the idea expressed  p45 by the exclamation "maneros" whenever the Egyptians use it. In the same way we may be sure that the likeness of a corpse which, as it is exhibited to them, is carried around in a chest, is not a reminder of what happened to Osiris, as some assume; but it is to urge them, as they contemplate it, to use and to enjoy the present, since all very soon must be what it is now and this is their purpose in introducing it into the midst of merry-making.85

18 As they relate, Isis proceeded to her son Horus, who was being reared in Buto,86 and bestowed the chest in a place well out of the way; but Typhon, who was hunting by night in the light of the moon, happened upon it. Recognizing the body he divided it into fourteen parts87 and scattered them, each in a different place. Isis learned of this and sought for them again, sailing through the swamps in a boat of papyrus.88 This is the reason why people sailing in such boats are not harmed by the crocodiles, since these creatures in their own way show either their fear or their reverence for the goddess.

The traditional result of Osiris's dismemberment is that there are many so‑called tombs of Osiris in Egypt;89 for Isis held a funeral for each part when she had found it. Others deny this and assert that she caused effigies of him to be made and these she distributed among the several cities, pretending that she was giving them his body, in order that he might receive divine honours in a greater number of cities, band also that, if Typhon should succeed in overpowering Horus, he might despair of ever finding  p47 the true tomb when so many were pointed out to him, all of them called the tomb of Osiris.90

Of the parts of Osiris's body the only one which Isis did not find was the male member,91 for the reason that this had been at once tossed into the river, and the lepidotus, the sea-bream, and the pike had fed upon it;92 and it is from these very fishes the Egyptians are most scrupulous in abstaining. But Isis made a replica of the member to take its place, and consecrated the phallus,93 in honour of which the Egyptians even at the present day celebrate a festival.

19 1 Later, as they relate, Osiris came to Horus from the other world and exercised and trained him for the battle. After a time Osiris asked Horus what he held to be the most noble of all things. When Horus replied, "To avenge one's father and mother for evil done to them," Osiris then asked him what animal he considered the most useful for them who go forth to battle; and when Horus said, "A horse," Osiris was surprised and raised the question why it was that he had not rather said a lion than a horse. Horus answered that a lion was a useful thing for a man in need of assistance, but that a horse served best for cutting off the flight of an enemy and annihilating him. When Osiris heard this he was much pleased, since he felt that Horus had now an adequate preparation. It is said that, as many were continually transferring their allegiance to Horus, Typhon's concubine, Thueris, also came over to him; and a serpent which pursued her dwas cut to pieces by Horus's men, and now, in memory of this, the people throw down a rope in their midst and chop it up.

Now the battle, as they relate, lasted many days and Horus prevailed. Isis, however, to whom Typhon was delivered in chains, did not cause him to be put to death, but released him and let him go. Horus could not endure this with equanimity, be laid hands upon his mother and wrested the royal diadem from her head; but Hermes put upon her a helmet like unto the head of a cow.

Typhon formally accused Horus of being an illegitimate child, but with the help of Hermes to plead his cause it was decided by the gods that he also was legitimate. Typhon was then overcome in two other battles. eOsiris consorted with Isis after his death, and she became the mother of Harpocrates, untimely born and weak in his lower limbs.94