Sahih Bukhari

Narrated Usama bin Zaid:""When Allah's Messenger (ﷺ) 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 Messenger (ﷺ)! Will you offer the prayer?"" He replied, ""The Musalla (place of the prayer) is ahead of you (in Al-Muzdalifa)