Bukhari :: Book 1 :: Volume 4 :: Hadith 181
Narrated Usama bin Zaid:
"When Allah's Apostle departed from 'Arafat, he turned towards a mountain pass where he answered the call of nature. (After he had finished) I poured water and he performed ablution and then I said to him, "O Allah's Apostle! Will you offer the prayer?" He replied, "The Musalla (place of the prayer) is ahead of you (in Al-Muzdalifa)."
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