To the right of the portal is one of the two grilled windows described as doors by ibn Ṭūlūn. It is one course higher than the corresponding window to the left, perhaps because the ground was higher here. Its monolithic lintel is covered by a slotted relieving arch whose broad keystone bears a recessed, uninscribed rectangular panel as high in proportion to the block that bears it as the tabula ansata of the portal lintel.
The corresponding window to the left is treated in the same fashion, except that the slotted relieving arch is monolithic, and its panel is carved with inscriptions, carved and (originally) inlaid in two scripts, arranged as on the relieving arch of the portal, with the central section executed in squared Kūfic in relief created by carving away the background. This inscription contains Qur'ān 48:28–29:
هُوَ ٱلَّذِىٓ أَرْسَلَ رَسُولَهُۥ بِٱلْهُدَىٰ وَدِينِ ٱلْحَقِّ لِيُظْهِرَهُۥ عَلَى ٱلدِّينِ كُلِّهِۦ ۚ وَكَفَىٰ بِالله شَهِيدًۭا
مُّحَمَّدٌۭ رَّسُولُ ٱللَّهِ ۚ وَٱلَّذِينَ مَعَهُۥٓ أَشِدَّآءُ عَلَى ٱلْكُفَّارِ رُحَمَآءُ بَيْنَهُمْ ۖ تَرَىٰهُمْ رُكَّعًۭا سُجَّدًۭا..
*He is the One Who has sent His Messenger with ˹right˺ guidance and the religion of truth, making it prevail over all others. And sufficient is Allah as a Witness* Muḥammad is the Messenger of Allah. And those with him are firm with the disbelievers and compassionate with one another. You see them bowing and prostrating...
In this selection, which is partly appropriate to mosques (where devotion and obedience are manifested), there may be some reflection of Rukn ad-Dīn's career as a ġāzī, unyielding toward disbelievers.
Terry Allen. Ayyubid Architecture. Solipsist Press, Occidental, California, 1999.






