Revelation 11:6

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

Luke 4:25

I tell you of a truth, Many widows were in Israel, in the days of Elijah, when the heaven was shut up three years and six months, while a great famine was thro' all the land.

James 5:16-18

Confess your faults one to another, brethren, and pray one for another, that ye may be healed: the fervent prayer of a righteous man availeth 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
I tell you of a truth, Many widows were in Israel, in the days of Elijah, when the heaven was shut up three years and six months, while a great famine was thro' all the land.
James 5:16
Confess your faults one to another, brethren, and pray one for another, that ye may be healed: the fervent prayer of a righteous man availeth much.