Musnad Ahmad 889:1

'Affan narrated to us, 'Abd al-Warith narrated to us, 'Abd Allah ibn Sawadah al-Qushayri narrated to me, he said: A man from the people of the desert narrated to me, from his father, and his father was a captive with the Messenger of Allah, may Allah bless him and grant him peace. He said: I heard Muhammad, may Allah bless him and grant him peace, saying: "A prayer in which the Mother of the Book is not recited is not accepted."