Proverbs 29:21 in the World English Bible
He who pampers his servant from youth will have him become a son in the end.
Context
20 Seest thou a man that is hasty in his words? there is more hope of a fool than of him.
21 He that delicately bringeth up his servant from a child shall have him become his son at the length.
22 An angry man stirreth up strife, and a furious man aboundeth in transgression.