“For it came to pass, when the flame went up toward heaven from off the altar, that the angel of the LORD ascended in the flame of the altar. And Manoah and his wife looked on it, and fell on their faces to the ground.”
King James Version (KJV)
13:20 The altar - That is, from that part of the rock which served instead of an altar, upon which the sacrifice was laid. Ascended - To manifest his nature and essence to be spiritual. Fell - Partly in reverence to that glorious presence manifested in so wonderful a manner: and partly, out of a religious horror and fear of death; for the prevention thereof they fell down in way of supplication to God.