Judges 13:19-21

So Manoah took the young goat with the grain offering, and offered it upon the rock to the LORD. And He did a wondrous thing while Manoah and his wife looked on— it happened as the flame went up toward heaven from the altar—the Angel of the LORD ascended in the flame of the altar! When Manoah and his wife saw this, they fell on their faces to the ground. When the Angel of the LORD appeared no more to Manoah and his wife, then Manoah knew that He was the Angel of the LORD.