Narrated Humran bin `Abbas: Muawiya said (to the people), "You offer a prayer which we, who were the companions of the Prophet never saw the Prophet offering, and he forbade its offering," i.e. the two rak`at after the compulsory `Asr prayer.

Narrated Muawiya: You offer a prayer which I did not see being offered by Allah's Apostle when we were in his company and he certainly had forbidden it (i.e. two rak`at after the `Asr prayer).