NET

6 These two have the power to close up the sky so that it does not rain during the time they are prophesying. They have power to turn the waters to blood and to strike the earth with every kind of plague whenever they want.

Darby

6 These have power to shut the heaven that no rain may fall during the days of their prophecy; and they have power over the waters to turn them into blood, and to smite the earth as often as they will with every plague.

KJV

6 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.