"A piece of bread" here is an exaggeration for a very small bribe or reward. AT: "a man will sin for very little gain" (See: [[rc://en/ta/man/translate/figs-hyperbole]])
The result of being stingy is spoken of as if poverty was overtaking the stingy person. The abstract noun "poverty" can be translated as an adjective. AT: "he will suddenly become poor" (See: [[rc://en/ta/man/translate/figs-idiom]] and [[rc://en/ta/man/translate/figs-abstractnouns]])