Inside I took many pictures of the tiles, that are used with wisdom, not covering whole walls, but only on selected areas: pendentives of the dome, the mihrab section, under the galleries.

Calligraphic inscriptions on the tiles above the mihrab (prayer niche) of the Sokollu Mehmet Paşa Mosque.
Classical Ottoman, around 1570.
The lower sections of the stained-glass windows bear inscriptions too; these texts are quotations from the Hadith (the corpus of the reports of the teachings, deeds and sayings of the prophet Muhammad).
In translation (from left to right): “Hurry to the common prayer before time passes” - “Whatever side you turn to, there will be the face of Allah” - “Hurry to repentance before death catches up (with you)”.

Correspondent: J.M.Criel, Antwerpen.
Sources: ‘Türkiye Tarihi Yerler Kılavuzu’ – M.Orhan Bayrak, Inkılâp Kitabevi, Istanbul, 1994 & Wikipedia.