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).
Hadith ReferenceSahih Bukhari / The Book of The Times of As-Salat (The Prayers) and Its Superiority / Hadith: 587
Hadith Gradingمحدثین:أحاديث صحيح البخاريّ كلّها صحيحة