Genesis 22:10-12

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.’