Musnad Abu Ya'la al-Mawsili 147:38

Shayban ibn Farrukh narrated to us, Salam ibn Miskin narrated to us, Yazid al-Dabbi narrated to us, from Anas ibn Malik, who said: "I have not prayed behind anyone after the Messenger of Allah (ﷺ) who was lighter in prayer than the Messenger of Allah (ﷺ), nor more concise in perfection."