These have power to shut heaven, that it rain not in the days of their prophecy: and have power over waters to turn them to blood, and to smite the earth with all plagues, as often as they will. (Revelation 11:6)
Not only do the witnesses have the power to call down on their enemies the same plague as that which fell first on Egypt, but they have authority to call down any of the plagues.
Waters … to blood.
The allusions thus far regarding these witnesses are reminiscing of Elijah (see the foregoing and on v. 5); this one appears to point to Moses and the first plague upon Egypt (Ex. 7:19-21).
Shut heaven.
As in v. 5, this appears also to be an allusion to Elijah, who predicted that there would be no rain in Israel for “these years, but according to my word” (1 Kings 17:1), or, as Luke gives it, “three years and six months” (Luke 4:25; cf. James 5:17).
Power.
Gr. exousia, “authority.”Exousia occurs twice in this verse and in both instances is translated “power.”