der Mohr hat seine Schuldigkeit getan, der Mohr kann gehen
proverb
used when a person who has done a favor or been helpful but whose services are no longer needed is ungratefully replaced, dismissed or let go
der Mohr hat seine Schuldigkeit getan, der Mohr kann gehen is a German proverb meaning “used when a person who has done a favor or been helpful (or by extension a thing that has been useful) but whose services are no longer needed is ungratefully replaced, dismissed or let go”.