It is narrated from Hazrat Umm Salamah (may Allah be pleased with her) that once the Prophet (peace and blessings be upon him) came to me after the Asr prayer and performed two rak'ahs. I said, "O Messenger of Allah, you did not use to perform this prayer before." The Prophet (peace and blessings be upon him) replied, "In fact, the delegation of Banu Tamim had arrived, because of which the two rak'ahs that I usually perform after Zuhr were missed."