נֶ֣פֶשׁ עָ֭מֵל עָ֣מְלָה לּ֑וֹ כִּֽי־אָכַ֖ף עָלָ֣יו פִּֽיהוּ׃
El alma del que trabaja, trabaja para sí; Porque su boca le constriñe.
Rashi on Proverbs
when his mouth forces him When his mouth forces him and demands food, then his labor stands up for him, for he eats what he has already worked for.