What did the Prophet Muhammad (saw) do when offering the Zuhr prayer at Medina and the `Asr prayer at Dhul-Hulaifa?
 Narrated Anas bin Malik:                     offered four rak`at of Zuhr prayer with the Prophet (p.b.u.h) at Medina and two rak`at at Dhul-Hulaifa. (i.e. shortened the `Asr prayer).