Kosher Foods - Tainted Food

Tainted Food

For obvious reasons, the Talmud adds to the biblical regulations a prohibition against consuming poisoned animals. Similarly, the Yoreh De'ah prohibits the drinking of water, if the water had been left overnight and uncovered in an area where there might be serpents, on the basis that a serpent might have left its venom in the water. In a place where there is no suspicion of snakes, this prohibition does not apply (tosafos, beitzah 6a).