1 John 5:16

If any one see his brother commit a sin which is not unto death, let him pray for him, and God will give him life, that is for them that do not sin unto death. There is a sin unto death: and for that I do not say that he should pray.

Treasury of Scripture Knowledge

Summary

Therefore pray not thou for this people, neither lift up cry nor prayer for them, neither make intercession to me: for I will not hear thee.

Bible References

Pray

1 John 5:16
If any one see his brother commit a sin which is not unto death, let him pray for him, and God will give him life, that is for them that do not sin unto death. There is a sin unto death: and for that I do not say that he should pray.