The statement that motion at one end does not move the opposite end supplies a juristic criterion for the extent of a pond.
It is a method of distinguishing a small body of water from a sufficiently large one.
Jurists differed about the action used to test the movement: stirring by hand, washing for wudu, or bathing for ghusl.
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Impurity in Stagnant and Running Water, Large Ponds, and Aquatic Creatures
The statement that motion at one end does not move the opposite end supplies a juristic criterion for the extent of a pond.
It is a method of distinguishing a small body of water from a sufficiently large one.
Jurists differed about the action used to test the movement: stirring by hand, washing for wudu, or bathing for ghusl.