The Book of Pilgrimage (Kitab Al-Hajj)
Muslim :: Book 7 : Hadith 3005
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.