Yiddish: The hat on a thief burns.

A thief's guilty conscience will betray him sooner or later.
SOURCE: Bernstein, Jüdische Sprichwörter und Redensarten.

אויפֿן גנבֿ ברענט דאָס היטל.

Afn ganef brent dos hitl.

The hat on a thief burns.