Genesis 22:9-11

New Catholic Bible

⁹ They then arrived at the place of which God had spoken. There Abraham built an altar and piled up the wood. He tied up his son Isaac and placed him upon the altar so that he was lying upon the wood. ¹⁰ Then Abraham reached out and took the knife to kill his son. ¹¹ But the angel of the Lord called out from heaven and said, “Abraham! Abraham!”

He answered, “Here I am.”