Kommentar zu Bereschit 25:11

ויהי אחרי מות אברהם ויברך וגו AND IT CAME TO PASS AFTER THE DEATH OF ABRAHAM THAT GOD BLESSED ISAAC etc. — He comforted him with the words of the formula of consolation which we offer to mourners (Sotah 14a). Another explanation is: Although the Holy One, blessed be He, had entrusted the blessings to Abraham to bless whomever he wished yet he (Abraham) feared to bless Isaac, because he foresaw that Esau would be born from him. He therefore said, “Let the Master of the blessings come himself and bless whomever it seems proper in his eyes” — God came and blessed him (Isaac)(Genesis Rabbah 61:6).

AND ISAAC DWELLED BY THE WELL LAHAI-ROI. I.e., near that place, or perhaps because it was not a city,¹⁸¹See above, 16:14, for the origin of the name “the well of Lahai-roi,” and there it expressly says that it was by a fountain of water in the wilderness. It was thus not a city. Scripture says that he pitched his tent near the well.

ויהי...ויברך, he made Yitzchok as successful in his undertakings as He made his father Avraham.