He that would cheat a Jew, must be a Jew.
More German Proverbs:
An egg is an egg, said the beadle, but he took the goose-egg.German
Justice has a waxen nose.
German
Drink upon salad costs the doctor a ducat; drink upon eggs costs him two.
German
If the eye does not want to see, neither light nor glasses will help.
German
If you have a good friend, you don't need a mirror.
German
It is not always good to be wise.
German