| Shaykh Usama was chosen by the Grand Mufti of Egypt, Shaykh Ali Gomaa to deliver the Friday sermons on his behalf in the Sultan Hassan Mosque from 2005 and until late 2009 | |
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| He studied with many esteemed scholars from all over the Islamic world, acquiring numerous ijazat all testifying to his accepted position in the unbroken-chains of transmission known as isnad essential in the field of Islamic sciences and scholarship |