Genesis 22:9-12

When they arrived at the place on Mount Moriah that God had shown him, Abraham built an altar and stacked the wood on it. He tied up his son Isaac and laid him on top of the wood on the altar. Then Abraham took the knife in his hand to plunge it into his son, but the angel of YAHWEH called to him from heaven, saying, “Abraham! Abraham!” “Yes, I’m here,” he answered. “Do not lay a hand on the boy or harm him,” he said, “for now, I know you are fully dedicated to me, since you did not withhold your son, your beloved son, from me.”