Thematic Bible: Angel attests the call to, by miracle

The angel of the LORD extended the tip of the staff that was in his hand and touched the meat and unleavened bread. Fire broke out from inside the boulder, consuming the meat and unleavened bread. Then the angel of the LORD vanished in front of him. When Gideon realized that he had seen the angel of the LORD himself, he cried out, "Oh no! Lord GOD! I've been looking right at the angel of the LORD and face-to-face at that!" "Calm down! Don't be afraid." the LORD replied. "You're not going to die!" read more.
So Gideon built an altar right there to the LORD and called it "The LORD is peace." (To this very day it still stands in Ophrah, which belongs to the descendants of Abiezer.)