By correcting two misreadings in the recent edition of the Ptolemaic-period funerary papyrus MMA 35.9.21, interesting parallels to facts reported by Plutarch, De Iside, come to light. Osiris and Isis already had sex in the womb of their mother before being born. Osiris was 28 years old at the time of his death, and this number is due to a connection with the lunar cycle.