Genesis 22:4-7

On the third day Abraham looked up and saw the place in the distance. He said to his servants, “Stay here with the donkey while I and the boy go over there. We will worship and then we will come back to you.” Abraham took the wood for the burnt offering and placed it on his son Isaac, and he himself carried the fire and the knife. As the two of them went on together, Isaac spoke up and said to his father Abraham, “Father?” “Yes, my son?” Abraham replied. “The fire and wood are here,” Isaac said, “but where is the lamb for the burnt offering?”