Genesis 22:11-12...11But the angel of the Lord called out to him from heaven, "Abraham! Abraham!" "Here I am," he replied. 12"Do not lay a hand on the boy," he said." Do not do anything to him. Now I know that you fear God, because you have not withheld from me your son, your only son."
Genesis 22:15-18...15The angel of the Lord called to Abraham from heaven a second time 16and said, "I swear by myself, declares the LORD, that because you have done this and have not withheld your son, your only son, 17I will surely bless you and make your descendants as numerous as the stars in the sky and as the sand on the seashore. Your descendants will take possession of the cities of their enemies, 18and through your offspring all nations on earth will be blessed, because you have obeyed me."