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

Job 5:17
Behold, happy is the man whom God correcteth: therefore despise not thou the chastening of the Almighty:

Proverbs 3:11
My son, despise not the chastening of the LORD; neither be weary of his correction:

Isaiah 26:16
LORD, in trouble have they visited thee, they poured out a prayer when thy chastening was upon them.