Correct
病从口入，祸从口出
/ bìng cóng kǒu rù, huò cóng kǒu chū /
Strokes
Definition
Illness enters by the mouth, trouble comes out by the mouth (idiom). A loose tongue may cause a lot of trouble.
Example
Definition
disease enters by the mouth and trouble comes out of the mouth—illness comes/stems from eating and trouble from speaking; mind your p's and q's