Rashi on Genesis 28:4/רש"י על בראשית כ״ח:ד׳

1את ברכת אברהם THE BLESSING OF ABRAHAM, (i. e. the blessing which He gave to (Abraham) to whom He promised, (12:2) “and I will make of thee a great nation”, and (26:4) “and all the nations shall bless themselves by thy seed”: may these blessings have been said regarding you — may that great nation and that blessed seed issue from you.