What was the command of Allah when He initially enjoined the prayer (Salat) upon the Prophet Muhammad (saw)?
 Narrated `Aisha:                     the mother of believers: Allah enjoined the prayer when He enjoined it, it was two rak`at only (in every prayer) both when in residence or on journey. Then the prayers offered on journey remained the same, but (the rak`at of) the prayers for non-travelers were increased.