In Jacob’s dream of the ladder to heaven at Luz, he was promised to be fruitful and numerous.
“12 He had a dream, and behold, a ladder was set on the earth with its top reaching to heaven; and behold, the angels of God were ascending and descending on it. 13 And behold, the LORD stood above it and said, “I am the LORD, the God of your father Abraham and the God of Isaac; the land on which you lie, I will give it to you and to your descendants. 14 “Your descendants will also be like the dust of the earth, and you will spread out to the west and to the east and to the north and to the south; and in you and in your descendants shall all the families of the earth be blessed. 15 “Behold, I am with you and will keep you wherever you go, and will bring you back to this land; for I will not leave you until I have done what I have promised you.”” (Ge 28:12-15 NAS95)
Jacob remember this promise many years later in the final days of his life as he passes on the blessing to Joseph’s sons (Jacob’s grandsons and Abraham’s 2nd great grandsons) by adopting them into his family as eventual tribes of Israel.
“3 Then Jacob said to Joseph, “God Almighty appeared to me at Luz in the land of Canaan and blessed me, 4 and He said to me, ‘Behold, I will make you fruitful and numerous, and I will make you a company of peoples, and will give this land to your descendants after you for an everlasting possession.’” (Ge 48:3-4 NAS95)
Jacob again recalls the blessing.
“God also said to him, “I am God Almighty; be fruitful and multiply; A nation and a company of nations shall come from you, and kings shall come forth from you.” (Ge 35:11 NAS95)
So, the Abrahamic Covenant is restated and confirmed to Abraham’s grandson Jacob, who is the Father of Israel. As with Isaac, it includes the command of “fruitful multiplicity.”