Genesis 22:6. So Abraham took the wood of the burnt offering and laid it on Isaac his son; and he took the fire in his hand, and a knife, and the two of them went together.
How does Abraham carry the fire?
It appears that God’s sacrifices, at least those requiring a burnt offering, were made with fire started by God Himself, usually by fire falling from heaven. This was also a sign that a sacrifice was accepted. This fire would be tended and not allowed to go out. Remember, Nadab and Abihu died for offering “strange fire.” This would have been a fire of their own kindling. So it probably means that he was carrying a burning torch or oil lamp or some such thing. The fire he carried would have been kept burning since a time that God had sent fire from heaven.