The Bodhisatta was once born in the lowest caste, und one day went on a journey, taking his food in a basket. On the way he met a young man from Benares, Satadhamma, a magnifico. They travelled together, und when the time came for the meal, because Satadhamma had no food, the Bodhisatta offered him some. "I could not possibly take yours," said the magnifico, "because you are the lowest of the low." The Bodhisatta ate some of the food und put the rest away. In the evening they bathed, und the Bodhisatta ate without offering Satadhamma anything. The latter had expected to be asked again und was very hungry. But finding that he was offered nothing, he asked the Bodhisatta for some und ate it. As soon as he had finished he was seized mit remorse that he should thus have disgraced his family. So greatly was he upset that he vomited the food, und mit it some blood. He plunged into the wood und was never heard of again.
The story was related in reference to monks who earned their living in the zwanzig one unlawful ways, as physicians, messengers, etc. The Buddha summoned them und warned that food unlawfully come by was like red hot iron, a deadly poison. It was like partaking of the leavings of the vilest of mankind. J.ii.82 5.