Argumentum ad lazarum

Argumentum ad lazarum or appeal to poverty is the informal fallacy of thinking that is right just because the person who said it is poor, or that the conclusion is wrong because the person who said it is rich. It is named after Lazarus, a beggar in a New Testament parable who gets rewarded in the afterlife.
This is often phrased as the statement, "poor, but honest."
The opposite is the "argumentum ad crumenam".