Genesis 22:2

22:2 God said, “Take your son – your only son, whom you love, Isaac – and go to the land of Moriah! Offer him up there as a burnt offering on one of the mountains which I will indicate to you.”

Genesis 22:12

22:12 “Do not harm the boy!” the angel said. “Do not do anything to him, for now I know that you fear God because you did not withhold your son, your only son, from me.”