<prompt> Translate the following text to EnglishKanisa la Hagia Sophia lina sehemu ya juu ya ukuta wa kanisa, na chini ya mosaic ya karne ya tisa ya Kristo Pantocrator, ina narthex ndefu na nyembamba.  <response>: You enter the Haghia Sophia church through the central portal, acrosea worn and well polished threshold of verd antique, and under a ninth-century mosaic of Christ Pantocrator, into the long, narrow narthex, running to right and left. 