Thematic Bible: Natural rocks sometimes used as

So Gideon went into his house and prepared a young goat and unleavened cakes from an ephah of flour. The meat he put in a basket, and the broth he put in a pot, and brought them to him under the terebinth and presented them. And the angel of God said to him, "Take the meat and the unleavened cakes, and put them on this rock, and pour the broth over them." And he did so. Then the angel of the LORD reached out the tip of the staff that was in his hand and touched the meat and the unleavened cakes. And fire sprang up from the rock and consumed the meat and the unleavened cakes. And the angel of the LORD vanished from his sight.

So Manoah took the young goat with the grain offering, and offered it on the rock to the LORD, to the one who works wonders, and Manoah and his wife were watching. And when the flame went up toward heaven from the altar, the angel of the LORD went up in the flame of the altar. Now Manoah and his wife were watching, and they fell on their faces to the ground.