Genesis 22:9-12

9They came to the place that God told them. Abraham built an altar there. He put the wood on it, ready for the fire. Then he tied his son Isaac. He lifted him up and he put him on top of the wood on the altar.

10Then Abraham took hold of the knife. He was ready to kill his son as a sacrifice.

11But then the angel of the Lord spoke to Abraham from heaven. He said, ‘Abraham! Abraham!’ Abraham replied, ‘Here I am.’

12The angel said, ‘Do not hurt the boy! Do not do anything to him. Now I know that you respect God and you obey him. Isaac is your only son and you agreed to offer him to me as a sacrifice. You did not try to keep him safe.’