Luke 4:25

Now I tell you of a certainty, that there were many widows in the days of Elias, in Israel, when the heaven was shut up three years and six months, so that a grievous famine was upon all the land.

Romans 10:9

That if thou shalt confess with thy mouth the Lord Jesus, and shalt believe in thy heart that God raised him from the dead, thou shalt be saved.

Romans 15:9

and that the Gentiles might glorify God for his mercy; as it is written, "For this cause will I confess unto thee among the Gentiles, and sing unto thy name."

Revelation 11:6

These have power to shut up the heaven, that no rain water the earth during 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.

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
Now I tell you of a certainty, that there were many widows in the days of Elias, in Israel, when the heaven was shut up three years and six months, so that a grievous famine was upon all the land.
Revelation 11:6
These have power to shut up the heaven, that no rain water the earth during 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.

If they pray

Romans 10:9
That if thou shalt confess with thy mouth the Lord Jesus, and shalt believe in thy heart that God raised him from the dead, thou shalt be saved.
Romans 15:9
and that the Gentiles might glorify God for his mercy; as it is written, "For this cause will I confess unto thee among the Gentiles, and sing unto thy name."