And there was a famine in the land; and Abram went down into Egypt to sojourn there; for the famine was grievous in the land. The frequent moves of Abram which the text indicate point to a growing scarcity of food; and the famine finally became so heavy that he removed to the land of Egypt with his herds.
Related Commentaries of Genesis 12:10
Genesis 12:10
10 And there was a famine in the land: and Abram went down into Egypt to sojourn there; for the famine was grievous in the land.