1 John 5:16

If a man see his brother sin a sin. Then a brother can be overtaken by sin.

Not unto death. There is a sin not unto death, and one unto death. The sin described in Heb 6:4-6 is evidently unto death; that described in Ga 6:1 is one not unto death. In the latter case the sinners can be restored, and we may pray for them with the assurance that they will be. This implies both work and prayer.
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