Verse 16 There is a sin unto death; that is, there is an extreme of inveterate and outrageous hostility to God, which transcends all bounds, and leaves no hope of reformation and pardon. This most solemn declaration of the apostle corresponds with what the Savior expressly taught, and what his terrible denunciations against hardened and determined offenders often implied. (Compare Mark 3:28-30. Matt. 23:29-36, and note.)