Revelation
King James Version (KJV)

“And if any man will hurt them, fire proceedeth out of their mouth, and devoureth their enemies: and if any man will hurt them, he must in this manner be killed.”
King James Version (KJV)
11:5 If any would kill them - As the Israelites would have done Moses and Aaron, #Num 16:41|. He must be killed thus - By that devouring fire.
Re 11:5 Fire proceedeth out of their mouth, and devoureth their enemies. Whatever is signified by these two witnesses, they have the power to destroy.