What is the evidence for the permissibility of Tayammum?

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The permissibility of Tayammum is established by the Quran, specifically the verse: "But if you find no water, then seek clean earth and wipe over your faces and your hands with it" (Quran 5:6). It is also proven by the Sunnah, exemplified by the narration of Ammar, and by the consensus (*Ijma'*) of the Ummah regarding its general permissibility.