The script on the flag is written in the "Thuluth" script. It is the "shahadah" or Islamic declaration of faith:
ð ə WORD_BOUNDARY s k ɹ ɪ p t WORD_BOUNDARY ɔ n ð ə WORD_BOUNDARY f l æ ɡ WORD_BOUNDARY ɪ z WORD_BOUNDARY ɹ ɪ t ə n WORD_BOUNDARY ɪ n ð ə WORD_BOUNDARY θ j ʊ l ʌ θ WORD_BOUNDARY s k ɹ ɪ p t WORD_BOUNDARY ɪ t WORD_BOUNDARY ɪ z WORD_BOUNDARY ð ə WORD_BOUNDARY ʃ æ h æ d ə WORD_BOUNDARY ɔ ɹ WORD_BOUNDARY ɪ s l ɑ m ɪ k WORD_BOUNDARY d ɛ k l ə ɹ ɹ eɪ ʃ ə n WORD_BOUNDARY ʌ v WORD_BOUNDARY f eɪ θ WORD_BOUNDARY