Proverbs 16:26 KJV

He that laboureth laboureth for himself; for his mouth craveth it of him.
Proverbs 16:26, King James Version

In context

25 There is a way that seemeth right unto a man, but the end thereof are the ways of death.

26 He that laboureth laboureth for himself; for his mouth craveth it of him.

27 An ungodly man diggeth up evil: and in his lips there is as a burning fire.