Calligraphy Bismillah in Thuluth script from Wikimedia commons. https://upload.wikimedia.org/wikipedia/commons/thumb/b/be/Basmalah-1wm.png/220px-Basmalah-1wm.png
This phrase is taken from the first chapter of the Quran and reads: In the name of Allah, Most Gracious, Most Merciful. (Yusuf Ali translation). It is recited by Muslims in prayers as well as being the opening to every chapter of the Quran except for the ninth.