7 Isaac said to his father Abraham, “My father?” “What is it, my son?” he replied. “Here is the fire and the wood,” Isaac said, “but where is the lamb for the burnt offering?” 8 “God will provide for himself the lamb for the burnt offering, my son,” Abraham replied. The two of them continued on together. 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. 10 Then Abraham reached out his hand, took the knife, and prepared to slaughter his son. 11 But the angel of the Lord called to him from heaven, “Abraham! Abraham!” “Here I am!” he answered. Source

19 You believe that God is one; well and good. Even the demons believe that—and tremble with fear. 20 But would you like evidence, you empty fellow, that faith without works is useless? 21 Was not Abraham our father justified by works when he offered Isaac his son on the altar? 22 You see that his faith was working together with his works and his faith was perfected by works. 23 And the scripture was fulfilled that says, “Now Abraham believed God and it was counted to him for righteousness,” and he was called God’s friend. Source