Thematic Bible: Angel attests the call to, by miracle

Then the angel of the LORD put forth the end of the staff that was in his hand, and touched the meat and the unleavened cakes; and there rose up fire out of the rock, and consumed the meat and the unleavened cakes. Then the angel of the LORD departed out of his sight. And when Gideon perceived that he was an angel of the LORD, Gideon said, Alas, O Lord GOD! for I have seen an angel of the LORD face to face. And the LORD said unto him, Peace be unto you; fear not: you shall not die. read more.
Then Gideon built an altar there unto the LORD, and called it Jehovahshalom: unto this day it is yet in Ophrah of the Abiezrites.