Verses with the word chastening in the New Testament (3 verses):

Hebrews 12:5
And ye have forgotten the exhortation which speaketh unto you as unto children, My son, despise not thou the chastening of the Lord, nor faint when thou art rebuked of him:

Hebrews 12:7
If ye endure chastening, God dealeth with you as with sons; for what son is he whom the father chasteneth not?

Hebrews 12:11
Now no chastening for the present seemeth to be joyous, but grievous: nevertheless afterward it yieldeth the peaceable fruit of righteousness unto them which are exercised thereby.