What does Genesis 28:3 mean?

After telling Jacob to travel to Paddan-aram, to the house of Rebekah's father Bethuel, to find a wife, Isaac now gives to Jacob an even more complete blessing than he had before when he thought he was blessing Esau (Genesis 27:27–29). This is the full blessing of the covenant between God and Abraham's descendants. Perhaps even Isaac thought the full covenant blessing was inappropriate for Esau, given his disposition and intermarriage with Canaanite women (Genesis 25:29–34; 26:34–35).

In any case, Isaac begins here by asking God Almighty to bless Jacob by multiplying him with descendants. He prays for Jacob to become a company—or "community"—of peoples. This language is similar to the promise God made to Abraham, that he would become a great nation. Jacob's offspring will now become the next generations in the millions of people God promised would come from Abraham.