Proverbs 11:17 in the World English Bible
The merciful man does good to his own soul, but he who is cruel troubles his own flesh.
Context
16 A gracious woman retaineth honour: and strong men retain riches.
17 The merciful man doeth good to his own soul: but he that is cruel troubleth his own flesh.
18 The wicked worketh a deceitful work: but to him that soweth righteousness shall be a sure reward.