According to Islamic scholars, if an impure cloth falls into water that is less than two qullah, both the cloth and the water become impure. But if the water is more than two qullah and the water does not change in color, taste, or smell due to the cloth, then the cloth and the water both remain pure.

Imam Nawawi (رحمة الله عليه) stated that if a najis cloth is dipped into water less than two qullah, the water becomes impure and the cloth does not become pure. However, when pure water flows over an impure area, it can purify it — but if impure matter falls into a small amount of water, it makes that water impure unless the water is large and unchanged.

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