Genesis 22:10-13

Then Abraham stretched out his hand and took the knife to kill his son as a sacrifice. But the LORD’s messenger called out to Abraham from heaven, “Abraham? Abraham?” Abraham said, “I’m here.” The messenger said, “Don’t stretch out your hand against the young man, and don’t do anything to him. I now know that you revere God and didn’t hold back your son, your only son, from me.” Abraham looked up and saw a single ram caught by its horns in the dense underbrush. Abraham went over, took the ram, and offered it as an entirely burned offering instead of his son.