Musnad Ahmad 30:577

'Abd al-Razzaq and Ibn Bakr narrated to us, they said: Ibn Jurayj informed us, 'Umar ibn 'Ata' ibn Abi al-Khuwar informed me: That while he was sitting with Nafi' ibn Jubayr, Abu 'Abd Allah, the son-in-law of Zayd ibn al-Rayyan—and Ibn Bakr said: Ibn al-Zabban—passed by them. Nafi' called him and said: I heard Abu Hurayrah saying: The Messenger of Allah, may Allah bless him and grant him peace, said: "A prayer with the Imam is better than twenty-five prayers that one prays alone."