Thematic Bible: Natural rocks sometimes used as

Then Gideon went and prepared a young goat and unleavened bread from an ephah of flour. He put the meat in a basket and poured the broth into a pot, and brought them to the angel right under the oak tree. Then he made his offering. The angel, who was God, replied, "Take the meat and the unleavened bread and lay them on this boulder. Then pour out the broth." So he did that. 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.

So Manoah prepared a young goat and a grain offering and offered it on a boulder to the LORD, who kept on performing miracles while Manoah and his wife watched continually. When the burnt offering was engulfed in flames that sprang up from the altar toward heaven, the angel of the LORD ascended in the flame that came from the altar. When Manoah and his wife observed this, they collapsed on their faces to the ground.