To Egypt it seems Isaac intended to go, it being a very fruitful place, and being encouraged to do so by his father's example upon the same occasion. But God saw good reasons to forbid Isaac to go thither, which it is needless to inquire, and not difficult to conjecture.
Related Commentaries of Genesis 26:2
Genesis 26:2
2 And the LORD appeared unto him, and said, Go not down into Egypt; dwell in the land which I shall tell thee of: