Genesis 26:2 - Wesley's Explanatory Notes

The Lord said, go not down into Egypt. Sojourn in this land — There was a famine in Jacob's days, and God bid him go down into Egypt, Genesis 46:3-4, a famine in Isaac's days, and God bid him not go down: a famine in Abraham's days, and God left him to his liberty, directing him neither way, which (considering that Egypt was always a place of trial to God's people) some ground upon the different characters of these three patriarchs. Abraham was a man of very intimate communion with God, and to him all places and conditions were alike; Isaac a very good man, but not cut out for hardship, therefore he is forbidden to go to Egypt; Jacob inured to difficulties, strong and patient, and therefore he must go down into Egypt, that the trial of his faith might be to praise, and honour, and glory. Thus God proportions his people's trials to their strength.