Musnad Ahmad 32:2065

Muhammad ibn Ja'far narrated to us, Shu'bah narrated to us, he said: I heard Hamzah al-Dabbi, he said: I heard Anas ibn Malik saying: "I have not prayed—meaning—behind any man, or any of the people, a prayer lighter than the prayer of the Messenger of Allah, may Allah bless him and grant him peace, while it was complete."