Genesis 22:5-8

5Abraham said to his servants, “Settle down and stay here with the donkey; the young man and I will go over there and worship [God], and we will come back to you.”

6Then Abraham took the wood for the burnt offering and laid it on [the shoulders of] Isaac his son, and he took the fire (firepot) in his own hand and the [sacrificial] knife; and the two of them walked on together.

7And Isaac said to Abraham, “My father!” And he said, “Here I am, my son.” Isaac said, “Look, the fire and the wood, but where is the lamb for the burnt offering?”

8Abraham said, “My son, God will provide for Himself a lamb for the burnt offering.” So the two walked on together.