Also, Islam was readily accepted by Zoroastrians who were employed in industrial and artisan positions because, according to Zoroastrian dogma, such occupations that involved defiling fire made them impure. Moreover, Muslim missionaries did not encounter difficulty in explaining Islamic tenets to Zoroastrian, as there were many similarities between the faiths. According to Thomas Walker Arnold, for the Persian, he would meet Ahura Mazda and Ahriman under the names of Allah and Iblis. At times, Muslim leaders in their effort to win converts encouraged attendance at Muslim prayer with promises of money and allowed the Quran to be recited in Persian instead of Arabic so that it would be intelligible to all. Later, the Samanids, whose roots stemmed from Zoroastrian theocratic nobility, propagated Sunni Islam and Islamo-Persian culture deep into the heart of Central Asia. The first complete translation of the Qur'an into Persian occurred during the reign of Samanids in the 9th century.