Musnad Ahmad 28:158

Hasan narrated to us, Ibn Lahi'ah narrated to us, Darraj narrated to us, from Abd al-Rahman ibn Jubayr, from Abdullah ibn Amr ibn al-As, who said: I heard the Messenger of Allah, may Allah bless him and grant him peace, saying: "Verily, the majority of the hypocrites of my nation are its reciters."