Genesis 22:6-8

So Abraham took the wood for the burnt offering and placed it on Isaac’s back. Abraham carried the knife and the fire, and the two of them walked up the mountain together. “Father?” Isaac broke the silence. “Yes, my son,” Abraham replied. “We have the wood and the fire,” Isaac said, “but where is the lamb for the burnt offering?” Abraham answered, “My son, God himself will provide the lamb for an offering.” So they went on together.