Verses with the word punishment in the New Testament (4 verses):

Matthew 25:46
And these shall go away into everlasting punishment: but the righteous into life eternal.

2 Corinthians 2:6
Sufficient to such a man is this punishment, which was inflicted of many.

Hebrews 10:29
Of how much sorer punishment, suppose ye, shall he be thought worthy, who hath trodden under foot the Son of God, and hath counted the blood of the covenant, wherewith he was sanctified, an unholy thing, and hath done despite unto the Spirit of grace?

1 Peter 2:14
Or unto governors, as unto them that are sent by him for the punishment of evildoers, and for the praise of them that do well.