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).