1 John 5:16

If any man see his brother commit a sin, which is not a mortal sin, let him pray to God, who will grant him life, for such as do not commit a mortal sin. there is a sin unto death: in which case I do not enjoin any prayer to be made.

Acts 8:24

Simon answered, do you pray to the Lord for me, that nothing like what you mention may befall me.

James 5:15

the prayer that proceeds from faith, shall save the sick; the Lord will raise him up, and his sins that may have been the occasion, shall be forgiven.

Treasury of Scripture Knowledge

Summary

And all the people said unto Samuel, Pray for thy servants unto the LORD thy God, that we die not: for we have added unto all our sins this evil, to ask us a king.

Bible References

Pray for thy

Acts 8:24
Simon answered, do you pray to the Lord for me, that nothing like what you mention may befall me.
James 5:15
the prayer that proceeds from faith, shall save the sick; the Lord will raise him up, and his sins that may have been the occasion, shall be forgiven.
1 John 5:16
If any man see his brother commit a sin, which is not a mortal sin, let him pray to God, who will grant him life, for such as do not commit a mortal sin. there is a sin unto death: in which case I do not enjoin any prayer to be made.