Yiddish: When a thief kisses you, count your teeth.

SOURCE: Kumove, Words Like Arrows.

װען אַ גנבֿ קושט, דאַרף מען זיך די צײן איבערצײלן.

Ven a ganef kusht, darf men zikh di tseyn ibertseyln.

When a thief kisses you, count your teeth.