Musannaf Ibn Abi Shayba 3:5801

Waki’ narrated to us, he said: Sa’id ibn al-Sa’ib al-Ta’ifi narrated to us, from Dawud ibn Abi ‘Asim al-Thaqafi, who said: I asked Ibn ‘Umar about the prayer at Mina. He said: "Have you heard of Muhammad, or have you believed in him? For he used to pray two rak’ahs at Mina."