Judges 6:20-22

²⁰And the angel of God said to him, Take the meat and the unleavened cakes and put them down on the rock over there, draining out the soup over them. And he did so.

²¹Then the angel of the Lord put out the stick which was in his hand, touching the meat and the cakes with the end of it; and a flame came up out of the rock, burning up the meat and the cakes: and the angel of the Lord was seen no longer.

²²Then Gideon was certain that he was the angel of the Lord; and Gideon said, I am in fear, O Lord God! for I have seen the angel of the Lord face to face.