Augustine of Hippo

From their single ancestor, in not much more than four hundred years, the Hebrew people became so numerous that at the time of the exodus from Egypt there were, we are told, six hundred thousand men of military age. This number does not include the Idumeans, who were not reckoned with the people of Israel, although they were descended from Israel's brother Esau, who was a grandson of Abraham. Nor does it include those other descendants of Abraham who were not of the line of his wife Sarah.

City of God 15.8 ↗