Proverbs 13:24 He that spareth his rod hateth his son: but he that loveth him chasteneth him betimes.Proverbs 22:15 Foolishness is bound in the heart of a child; but the rod of correction shall drive it far from him.
Proverbs 23:13 Withhold not correction from the child: for if thou beatest him with the rod, he shall not die.
FYI. The Hebrew word translated "rod" above is
"Shebet" (7626)
"From an unused root probably meaning to branch off; a scion, that is, (literally) a stick (for punishing, writing, fighting, ruling, walking, etc.) or (figuratively) a clan: - X correction, dart, rod, sceptre, staff, tribe."