Rubbing hands and feet with dust (Tayammum)
Bukhari :: Book 1 :: Volume 7 :: Hadith 336
Narrated 'Abdur Rahman bin Abza:
that while he was in the company of 'Umar, 'Ammar said to 'Umar, "We were in a detachment and became Junub and I blew the dust off my hands (performed the rolling over the earth and prayed.)"
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