Genesis 22:8-11

22:8 “God will provide for himself the lamb for the burnt offering, my son,” Abraham replied. The two of them continued on together.

22:9 When they came to the place God had told him about, Abraham built the altar there and arranged the wood on it. Next he tied up his son Isaac and placed him on the altar on top of the wood. 22:10 Then Abraham reached out his hand, took the knife, and prepared to slaughter his son. 22:11 But the Lord’s angel called to him from heaven, “Abraham! Abraham!” “Here I am!” he answered.