der Mohr hat seine Schuldigkeit getan, der Mohr kann gehen

Etymology
lit. 'the Moor has done his duty, the Moor can go'.

The original quotation was „Der Mohr hat seine Arbeit getan, der Mohr kann gehen“ (“The Moor has done his work, the Moor can go"). It comes from the play  by .  The word  is now more commonly replaced by.