Our piece would have formed part of a row of tiles, as the text is incomplete, reading:
‘…earth. Who is there…’
This forms part of the Ayat al-Kursi or ‘Throne Verse’ (255) from sura 2 (al-Baqarah) of the Qur’an. Completed, the two sentences should read: ‘His are all things in the heavens and on earth. Who is there can intercede in His presence except as He permitteth?’
Went back to check
https://www.mohtashemi.art/artworkDetail/781096/17919/calligraphic-tile