Revelation 11:6

These men have the power to close the heavens, that 'no rain may fall' during the time that they are teaching; and they have power 'to turn the streams into blood, and to smite the land with any Curse,' whenever they will.

Luke 4:25

There were, doubtless, many widows in Israel in Elijah's days, when the heavens were closed for three years and six months, and a severe famine prevailed throughout the country;

James 5:16-18

Therefore, confess your sins to one another and pray for one another, that you may be cured. Great is the power of a good man's fervent prayer.

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
There were, doubtless, many widows in Israel in Elijah's days, when the heavens were closed for three years and six months, and a severe famine prevailed throughout the country;
James 5:16
Therefore, confess your sins to one another and pray for one another, that you may be cured. Great is the power of a good man's fervent prayer.