Musnad Ahmad 32:1814

Sulayman ibn Dawud narrated to us, Isma'il ibn Ja'far narrated to us, Sharik ibn 'Abd Allah ibn Abi Namir narrated to us, from Anas ibn Malik, who said: "I have never prayed behind an Imam who was lighter or more complete in prayer than the Messenger of Allah, may Allah bless him and grant him peace."