names of the four caliphs in the islamic state, abu bakr, omar, osman, ali, are written on leather in arabic, islamic calligraphy

calligraphy calligraphers arabic islamic art religion pen page skin leather ayet el kursi manuscript text allah god mohammad muhammad abu bakr omar osman ali four caliphs islam quran ramadan koran kareem muslim arab arabian artwork wallpaper background culture education historical holy ink language prayer script spiritual symbol writing word vintage written