In Fariduddin Attar's Elahi Nameh (الهی‌نامه), the 'Tale of the Commander of the Faithful Umar' explores the necessity of absolute spiritual commitment and the rejection of religious syncretism or indecision. When Umar brings a portion of the Torah to the Prophet Muhammad, the Prophet rebukes him, stating that one cannot simply dabble in another faith; one must either fully commit to it (becoming a 'pure Jew') or fully commit to Islam. Attar uses this anecdote to teach that 'in religion, incompletion is incomplete' (در دین ناتمامی ناتمامست), meaning that spiritual seekers must not waver between different paths but must fully immerse themselves in a single, chosen devotion.