Revelation 11:6

These have authority to shut heaven, that it may not rain in the days of their prophecy; and they have authority over the waters, to turn them to blood, and to smite the earth with every plague, as often as they wish.

Luke 4:25

And I tell you, in truth, there were many widows in Israel in the days of Elijah, when the heaven was shut up for three years and six months, so that a great famine was on all the land:

James 5:16-18

Confess your faults one to another, and pray for one another, that you may be restored to health: the fervent prayer of a righteous man avails much.

Treasury of Scripture Knowledge

Summary

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.

Bible References

Power

Luke 4:25
And I tell you, in truth, there were many widows in Israel in the days of Elijah, when the heaven was shut up for three years and six months, so that a great famine was on all the land:
James 5:16
Confess your faults one to another, and pray for one another, that you may be restored to health: the fervent prayer of a righteous man avails much.