GEN788 According to Ramban [Nachmanidies – AJL], Abraham should have stayed in Canaan; he should have had faith in God that He would sustain him despite the famine. Abraham’s decision to leave was not his only error; it also put Sarah in a position of moral hazard because, as a result of going to Egypt, she was forced to tell a lie. In saying that she was Abraham’s sister and not his wife, she was taken into Pharaoh’s herem where she might have been forced to commit an act of adultery. This is a very harsh judgment, made more so by Ramban’s further assertion that it was because of this lack of faith that Abraham’s children were sentenced to exile in Egypt centuries later.  SACKS 16