Musnad Ahmad 482:120

Abu Salamah al-Khuza'i narrated to us, al-Walid ibn al-Mughirah narrated to us, Mushrih ibn Ha'an narrated to us, from 'Uqbah ibn 'Amir, from the Messenger of Allah, may Allah bless him and grant him peace, that he used to say: "Indeed, the majority of the hypocrites of this nation are its reciters."