MACHEATH: You may proclaim, good sirs, your fine philosophy
But till you feed us, right and wrong can wait!

[Erst kommt das Fressen, dann kommt die Moral.] 

Bertolt Brecht (1898-1956) German poet, playwright, director, dramaturgist

Die Dreigroschenoper [The Three-Penny Opera], Act 2, sc. 3 (1928)

Alt. trans.:

• However much you twist, whatever lies you tell / Food is the first thing, morals follow on." [used by the Pet Shop Boys, "What Keeps Mankind Alive?", Can You Forgive Her (1993)
• Food first, then morality.
• Food comes first, then morals.
• First comes a full stomach, then comes ethics.