Revelation 11:6

They have the power to shut up the sky, so that no rain will fall upon the earth as long as they prophesy, and they have power over the waters to turn them into blood, and to smite the earth with any plague as often as they please.

Luke 4:25

But in truth I tell you, there were many widows in Israel in Elijah's time, when the heaven was closed for three years and a half, and there was a great famine over all the land,

James 5:16-18

So practice confessing your sins to one another, and praying for one another, that you may be cured. An upright man's prayer, when it keeps at work, is very powerful.

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
But in truth I tell you, there were many widows in Israel in Elijah's time, when the heaven was closed for three years and a half, and there was a great famine over all the land,
James 5:16
So practice confessing your sins to one another, and praying for one another, that you may be cured. An upright man's prayer, when it keeps at work, is very powerful.