Revelation 11:4-6

These two witnesses are the two olive trees and the two lampstands that stand before the Lord God of the whole earth. If anyone attempts to harm them, fire will flow out of their mouths and consume their foes. All who seek to harm them will die in this way. They have authority to shut the heavens so that no rain will fall during the days of their prophesying. They have authority over the waters to turn them into blood and to strike the earth with every plague imaginable, as often as they desire.