Purity: Purification of a Ḥaṣīr (Woven Mat) with Kurr, Flowing, or Qalīl Water
Practical Laws of Islam as per the teachings of Ayatullah Sistani
Ruling 157
If a ḥaṣīr[4]1 that has been woven with thread becomes impure and is immersed in kurr or flowing water, it becomes pure after the intrinsic impurity has been removed. However, if a person wants to wash it with qalīl water, it must be squeezed in whatever way possible, even by stamping on it, so that the remaining water separates from it.
-Ayatullah Sistani, Practical Laws of Islam, Purification (Taharah)
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[4] A ḥaṣīr is a mat that is made by plaiting or weaving straw, reed, or similar materials of plant origin.