If a person dies in a well or a pond whose water is less than a kurr and the water does not change as a result, seventy buckets should be drawn from it, and it becomes pure afterward. When mentioning a pond alongside a well, it refers to a pond that has a source of water flowing from the ground. Such a pond has the same ruling as wells. However, if the pond does not have a source of water and something that renders it impure falls into it, it is not permissible to use it if the water is less than a kurr. Evidence supports this ruling.