Plutarch, De Iside et Osiride 16

τρέφειν δὲ τὴν Ἶσιν ἀντὶ μαστοῦ τὸν δάκτυλον εἰς τὸ στόμα τοῦ παιδίου διδοῦσαν, νύκτωρ δὲ περικάειν τὰ θνητὰ τοῦ σώματος· αὐτὴν δὲ γενομένην χελιδόνα τῇ κίονι περιπέτεσθαι καὶ θρηνεῖν, ἄχρι οὗ τὴν βασίλισσαν παραφυλάξασαν καὶ ἐκκραγοῦσαν, ὡς εἶδε περικαόμενον τὸ βρέφος, ἀφελέσθαι τὴν ἀθανασίαν αὐτοῦ. τὴν δὲ θεὰν φανερὰν γενομένην αἰτήσασθαι τὴν κίονα τῆς στέγης· ὑφελοῦσαν δὲ ῥᾷστα περικόψαι τὴν ἐρείκην, εἶτα ταύτην μὲν ὀθόνῃ περικαλύψασαν καὶ μύρον καταχεαμένην ἐγχειρίσαι τοῖς βασιλεῦσι, καὶ νῦν ἔτι σέβεσθαι Βυβλίους τὸ ξύλον ἐν ἱερῷ κείμενον Ἴσιδος. τῇ δὲ σορῷ περιπεσεῖν καὶ κωκῦσαι τηλικοῦτον, ὥστε τῶν παίδων τοῦ βασιλέως τὸν νεώτερον ἐκθανεῖν, τὸν δὲ πρεσβύτερον μεθʼ ἑαυτῆς ἔχουσαν καὶ τὴν σορὸν εἰς πλοῖον ἐνθεμένην ἀναχθῆναι. τοῦ δὲ Φαίδρου ποταμοῦ πνεῦμα τραχύτερον ἐκθρέψαντος ὑπὸ τὴν ἕω, θυμωθεῖσαν ἀναξηρᾶναι τὸ ῥεῖθρον.

They relate that Isis nursed the child by giving it her finger to suck instead of her breast, and in the night she would burn away the mortal portions of its body. She herself wrould 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.