Luke 4:25

In very truth I tell you there were many widows in Israel in the days of Elijah, when the heavens were closed for three years and six months, when a great famine came over all the land;

Romans 10:9

Confess with your mouth "Jesus is Lord," and believe in your heart that God actually raised him from the dead, and you will be saved.

Romans 15:9

and so that the Gentiles also should praise God for his mercy, as it is written, Therefore I will offer praise to thee among the Gentiles, And sing to thy name.

Revelation 11:6

These have power to shut heaven so that it does not rain 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.

Treasury of Scripture Knowledge

Summary

When heaven is shut up, and there is no rain, because they have sinned against thee; if they pray toward this place, and confess thy name, and turn from their sin, when thou afflictest them:

If they pray

Bible References

Heaven

Luke 4:25
In very truth I tell you there were many widows in Israel in the days of Elijah, when the heavens were closed for three years and six months, when a great famine came over all the land;
Revelation 11:6
These have power to shut heaven so that it does not rain 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.

If they pray

Romans 10:9
Confess with your mouth "Jesus is Lord," and believe in your heart that God actually raised him from the dead, and you will be saved.
Romans 15:9
and so that the Gentiles also should praise God for his mercy, as it is written, Therefore I will offer praise to thee among the Gentiles, And sing to thy name.