Revelation 11:4-6

These two witnesses are the two olive trees and the two lampstands that stand in the presence of the Lord who rules the earth. Any enemy who tries to harm them will be destroyed by the fire that comes out of their mouths. They have the power to lock up the sky and to keep rain from falling while they are prophesying. And whenever they want to, they can turn water to blood and cause all kinds of terrible troubles on earth.