21 Then the angel of the LORD put forth the end of the staff that was in his hand, and touched the flesh and the unleavened cakes; and there rose up fire out of the rock, and consumed the flesh and the unleavened cakes. Then the angel of the LORD departed out of his sight.
[AD 397] Ambrose of Milan on Judges 6:19-21
Even at that time was it declared in a mystery that the Lord Jesus in His Flesh would, when crucified, do away the sins of the whole world, and not only the deeds of the body, but the desires of the soul. For the flesh of the kid refers to sins of deed, the broth to the enticements of desire as it is written: "For the people lusted an evil lust, and said, Who shall give us flesh to eat?" That the Angel then stretched forth his staff, and touched the rock, from which fire went out, shows that the Flesh of the Lord, being filled with the Divine Spirit, would burn away all the sins of human frailty. Wherefore, also, the Lord says: "I am come to send fire upon the earth."