Genesis 26:1-6

Now there was a famine in the land [of Canaan], besides the previous famine that had occurred in the days of Abraham. So Isaac went to Gerar, to Abimelech king of the Philistines. The LORD appeared to him and said, “Do not go down to Egypt; stay in the land of which I will tell you. Live temporarily [as a resident] in this land and I will be with you and will bless and favor you, for I will give all these lands to you and to your descendants, and I will establish and carry out the oath which I swore to Abraham your father. [Gen 22:16-18; Ps 105:9] I will make your descendants multiply as the stars of the heavens, and will give to your descendants all these lands; and by your descendants shall all the nations of the earth be blessed, [Gen 22:18; Acts 3:25, 26; Gal 3:16] because Abraham listened to and obeyed My voice and [consistently] kept My charge, My commandments, My statutes, and My laws.” So Isaac stayed in Gerar.