New Revised Standard Version
They have authority to shut the sky, so that no rain may fall during the days of their prophesying, and they have authority over the waters to turn them into blood, and to strike the earth with every kind of plague, as often as they desire.

Contemporary English Version
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.

New American Bible
They have the power to close up the sky so that no rain can fall during the time of their prophesying. They also have power to turn water into blood and to afflict the earth with any plague as often as they wish.

Douay-Rheims Bible
These have power to shut heaven, that it rain not in the days of their prophecy: And they have power over waters, to turn them into blood and to strike the earth with all plagues, as often as they will.

These have power to shut heaven, that it rain not in the days of their prophecy: And they have power over waters, to turn them into blood and to strike the earth with all plagues, as often as they will.

power.

1 Kings 17:1 And Elias the Thesbite, of the inhabitants of Galaad, said to Achab: As the Lord liveth, the God of Israel, in whose sight I stand, there shall not be dew nor rain these years, but according to the words of my mouth.

Luke 4:25 In truth I say to You, there were many widows in the days of Elias in Israel, when heaven was shut up three years and six months, when there was a great famine throughout all the earth.

James 5:16-18 Confess therefore your sins one to another: and pray one for another, that you may be saved. For the continual prayer of a just man availeth much. . . .

have power over.

Ezekiel 7:1-12:28,14 And the word of the Lord came to me, saying: . . .

Psalm 105:26-36 He sent Moses his servant: Aaron the man whom he had chosen. . . .