מדרש אויף בראשית 26:2

Stay in the land. As if to say that here is your divine presence.

In the land that I point out to you. In the merit of Abraham that I spoke to him "on one of the mountains that I will point out to you." (Genesis 22:2)

(Gen. 26:1, cont.:) AND ISAAC WENT TO ABIMELECH…. He had wanted to go down to Egypt, < but > the Holy One immediately appeared to him. He said to him (in vs. 2): DO NOT GO DOWN TO EGYPT. Abraham went down < there >, but Isaac did not go down. Now why did he say, not to Abraham, but only to Isaac: DO NOT GO DOWN TO EGYPT? R. Hosha'ya said: The Holy One said unto Isaac: Because your father came to the land from abroad, he went down to Egypt; but, since you were born in the land of Israel and < represent > a pure burnt offering, how could you be going down?²³Gen. R. 64:3. Ergo (in Gen. 26:2): DO NOT GO DOWN TO EGYPT.