Thematic Bible: Natural rocks sometimes used as

And Gideon went and made ready a kid, and sweet cakes of an Ephah of flour, and put the flesh in a basket and the broth in a pot, and brought it out unto him under the oak and presented it. And the angel of God said unto him, "Take the flesh and the sweet cakes and put them upon this rock, and pour out the broth." And he did so. Then the angel of the LORD put forth the end of the staff that was in his hand and touched the flesh and the cakes. And there arose up fire out of the rock and consumed the flesh and the cakes. And the angel of the LORD vanished out of his sight.

And Manoah took a kid with a meat offering and offered it upon a rock unto the LORD. And the angel did wonderfully, Manoah and his wife looking upon. For when the flame came up out of the altar, the angel of the LORD ascended up in the flame of the altar. And Manoah and his wife looked upon and fell flat on their faces unto the ground.