Sahih Muslim Book 7, Hadith Number 3005.

Chapter : Excellence of making a halt at al Muha’ab, on the day of Nahr, and observing prayer there.

Abd al-‘Aziz b. Rufai’ (Allah be pleased with him) said: I asked Anas b. Malik to tell me about something he knew about Allah’s Messenger (may peace be upon him), viz. where he observed the noon prayer on Yaum al-Tarwiya. He said: At Mina. I said: Where did he observe the afternoon prayer on the Yaum an-Nafr? and he said: It was at al-Abtah. He then said: Do as your rulers do.