Luke 4:25

I also tell you of a truth, that there were many widows in Israel in the days of Elijah, when heaven was shut up three years and six months, so that there was a great famine over all the land;

Romans 10:9

For if you confess with your mouth the Lord Jesus, and believe with your mind that God raised him from the dead, you shall be saved;

Romans 15:9

and that the nations should glorify God for mercy; as it is written, For this cause will I praise thee among nations, and sing to thy name.

Revelation 11:6

These have power to shut heaven, that it may not rain in 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
I also tell you of a truth, that there were many widows in Israel in the days of Elijah, when heaven was shut up three years and six months, so that there was a great famine over all the land;
Revelation 11:6
These have power to shut heaven, that it may not rain in 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
For if you confess with your mouth the Lord Jesus, and believe with your mind that God raised him from the dead, you shall be saved;
Romans 15:9
and that the nations should glorify God for mercy; as it is written, For this cause will I praise thee among nations, and sing to thy name.