Proverbs 5:9

5:9 lest you give your vigor to others

and your years to a cruel person,

Proverbs 11:17

11:17 A kind person benefits himself,

but a cruel person brings himself trouble.

Proverbs 17:11

17:11 An evil person seeks only rebellion,

and so a cruel messenger will be sent against him.

Proverbs 27:4

27:4 Wrath is cruel and anger is overwhelming,

but who can stand before jealousy?