Bible Verses About Altars: Natural rocks sometimes used as

Gid'on went in, cooked a young goat and made matzot from a bushel of flour. He put the meat in a basket and the broth in a pot, brought them out to him under the pistachio tree and presented them.

The angel of God said to him, "Take the meat and matzot, lay them on this rock, and pour out the broth." Gid'on did so.

Then the angel of ADONAI reached out with the stick he was holding, touched the meat and matzot, and fire shot up out of the rock and burned up the meat and matzot. Then the angel of ADONAI disappeared before his eyes.

Manoach took the kid and the grain offering and offered them on the rock to ADONAI. Then, with Manoach and his wife looking on, the angel did something wonderful -

as the flame went up toward the sky from the altar, the angel of ADONAI went up in the flame from the altar. When Manoach and his wife saw it, they fell to the ground on their faces.