Luke 4:25

I tell you of a truth, Many widows were in Israel, in the days of Elijah, when the heaven was shut up three years and six months, while a great famine was thro' all the land.

Romans 10:9

That if thou confess with thy mouth the Lord Jesus, and 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 I will confess to thee among the Gentiles, and sing unto thy name.

Revelation 11:6

These have power to shut heaven, that it rain not in the days of their prophesying, and have power over the waters, to turn them into 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
I tell you of a truth, Many widows were in Israel, in the days of Elijah, when the heaven was shut up three years and six months, while a great famine was thro' all the land.
Revelation 11:6
These have power to shut heaven, that it rain not in the days of their prophesying, and have power over the waters, to turn them into blood, and to smite the earth with all plagues as often as they will.

If they pray

Romans 10:9
That if thou confess with thy mouth the Lord Jesus, and 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 I will confess to thee among the Gentiles, and sing unto thy name.