'Unleavened' in the Bible

Gideon went in, and prepared a young goat, and unleavened cakes of an ephah of meal. He put the meat in a basket and he put the broth in a pot, and brought it out to him under the oak, and presented it.

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

Then the angel of Yahweh stretched out the end of the staff that was in his hand, and touched the meat and the unleavened cakes; and fire went up out of the rock, and consumed the meat and the unleavened cakes; and the angel of Yahweh departed out of his sight.