Proverbs 19:18
"Chasten thy son while there is hope, and let not thy soul spare for his crying."
Cross References (ranked by relevance)
Proverbs 13:24
12
He that spareth his rod hateth his son: but he that loveth him chasteneth him betimes.
Proverbs 29:15
11
The rod and reproof give wisdom: but a child left to himself bringeth his mother to shame.
Proverbs 22:15
Foolishness is bound in the heart of a child; but the rod of correction shall drive it far from him.
Proverbs 29:17
Correct thy son, and he shall give thee rest; yea, he shall give delight unto thy soul.