If neglecting to wash hands before meals could lead to disaster, the Talmud teaches that neglecting to wash after meals was equally dangerous — and one story proved why. A man's failure to wash his hands after eating led directly to a woman's death.
The custom of washing after meals — mayim aharonim, the "final waters" — was instituted because of "Sodomite salt," a particularly harsh salt that could blind the eyes if traces remained on the fingers. After eating, a person's hands might carry residue of this salt. If he then rubbed his eyes without washing, he could lose his sight.
The Talmud (Yoma 83b, Hullin 106a) records the tragic sequence: a man ate a meal and did not wash afterward. He went to a butcher, still with salt on his fingers, and ordered meat. The butcher noticed his unwashed hands and concluded he was not observant — and therefore his money was worthless, or his word unreliable. Through a chain of misunderstandings that followed, a woman was falsely accused and suffered the ultimate consequence.
The sages used this story as proof that "the final waters" were not optional. "Mayim aharonim are an obligation," they declared — not merely a custom, not merely a stringency, but a requirement. Small rituals have large consequences. The man who skips washing because it seems trivial does not see the chain of events he sets in motion. But the sages saw it — and they insisted: wash your hands. Every time. Before and after. The world is more fragile than you think.