Musnad Ahmad 32:1225

Rawh narrated to us, Uthman ibn Sa'd narrated to us, he said: I heard Anas ibn Malik saying: "I do not recognize anything of what I lived through with the Messenger of Allah, peace and blessings of Allah be upon him, today." Abu Rafi' said: "O Abu Hamzah, not even the prayer?" He said: "Have you not known what Al-Hajjaj did regarding the prayer?"