The proof for this practice is the hadith of Imam Muslimwherein Umar reported: The Messenger of Allah (P.B.U.H.) said,If one completes (and perfects) the ablution and then says, Itestify that there is no god except Allah, the One Who has nopartner, and that Muhammad (P.B.U.H.) is His slave andMessenger, the eight gates of paradise will be opened for himand he may enter any of them that he wishes.