Augustine of Hippo

Having built an altar there and called upon God, Abraham proceeded thence and dwelt in the desert and was compelled by pressure of famine to go on into Egypt. There he called his wife his sister, and he told no lie. For she was this also, because she was near of blood; just as Lot, on account of the same nearness, being his brother's son, is called his brother. Now he did not deny that she was his wife but held his peace about it, committing to God the defense of his wife's chastity and providing as a man against human wiles. …

City of God 16.19 ↗