MM, Genesis 22:17-18 says this of Abraham “in blessing I will bless you, and in multiplying I will multiply your descendants…and your descendants shall possess the gate of their enemies. In your seed all the nations of the earth shall be blessed, because you obeyed My voice.”
Again in speaking of Abraham Genesis 12:3 says 'I will bless those who bless you , and I will curse him who curses you; and in you all the families of the earth shall be blessed."
This goes back to the beginning where God created male and female in His image, and He blessed them and said, “Be fruitful and multiply; fill the earth and subdue it.”
God says the same thing to Noah who was a just man and walked with God(Gen.6:1). "So God blessed Noah and his sons and said to them: “Be fruitful and multiply and fill the earth.”(Gen. 9:1)
Abraham was a righteous man who walked in the Spirit of God. In other words, he was a good seed( Matt.13:38 the good seed stands for the people of the kingdom) and was sowing or spreading the word of God (the seed: Luke 8:11). In this, he was bearing the fruit of the Spirit. God promises that when we sow the good seed, we will produce a good crop that multiplies. Matt. 13:8 says, “Still other seed fell on good soil where it produced a crop a hundred, sixty or thirty times what was sown.” Gen. 26:12 “Then Isaac sowed in that land and reaped in the same year a hundredfold and the Lord blessed him.”