Bede : Noah indeed, when he was five hundred years old, begot Shem, Ham, and Japheth. Therefore, Noah was born in the tenth generation, because he both represented and led the lives of those who are perfect in the observance of the Decalogue. He begot three sons, so that his service to the Lord in the faith of the Holy Trinity and the produce of spiritual virtues would also be signified by the fruit of his physical offspring; although, according to history, it was appropriate for him to have begotten three sons, in whom the seed of the world perishing was to be left to a future generation, so that through the offspring of the three sons, indeed, the three parts of the world would be filled. For the sons of Shem especially possessed Asia, the offspring of Ham Africa, and the descendants of Japheth Europe. — Commentary on Genesis (Hexaemeron) Ephrem the Syrian : After recounting the ten generations from Adam to Noah, Moses said, "Noah was five hundred years old and begot Shem and Ham and Japheth." During this entire time Noah was an example to his sons by his virtue, for he had preserved virginity for five hundred years among those of whom it was said, "All flesh corrupted its path." — COMMENTARY ON Genesis 6.1.1