Gideon went in, and made ready a kid, and unleavened cakes of an ephah of meal: the flesh he put in a basket, and he put the broth in a pot, and brought it out to him under the oak, and presented it.
"There went up fire out of the rock"  (Judges 6:21).  This miracle must have astounded Gideon, leaving him no room whatever to doubt the identity of his celestial visitor.