Revelation 11:6

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

Luke 4:25

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

James 5:16-18

Confess your faults one to another, and pray one for another, that you may be cured, for the prayer of the righteous operates with great power.

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
I also tell you of a truth, that there were many widows in Israel in the days of Elijah, when heaven was shut up three years and six months, so that there was a great famine over all the land;
James 5:16
Confess your faults one to another, and pray one for another, that you may be cured, for the prayer of the righteous operates with great power.