Luke 4:25

I assure you, though there were many widows in Israel, when the heaven had furnished no rain for three years and a half, and a great famine spread through all the land:

Romans 10:9

for if you openly confess, that Jesus is the Lord, and sincerely believe, that God has raised him from the dead, you shall be saved.

Romans 15:9

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

Revelation 11:6

during their prophecy they have power to prevent any rain descending from heaven: their power extends over waters to turn them to blood, and to smite the earth with what plagues they please.

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
I assure you, though there were many widows in Israel, when the heaven had furnished no rain for three years and a half, and a great famine spread through all the land:
Revelation 11:6
during their prophecy they have power to prevent any rain descending from heaven: their power extends over waters to turn them to blood, and to smite the earth with what plagues they please.

If they pray

Romans 10:9
for if you openly confess, that Jesus is the Lord, and sincerely believe, that God has raised him from the dead, you shall be saved.
Romans 15:9
and you Gentiles ought to glorify God for his mercy; as it is written, "for this cause I will confess to thee among the Gentiles, and sing unto thy name ."