Most were forced to convert due to the systematic abuse and discrimination inflicted upon them by followers of Islam. Once a Zoroastrian family was forced to convert to Islam, the children were sent to an Islamic school to learn Arabic and study the teachings of Islam, as a result some of these people lost their Zoroastrian faith. However, under the Samanids, who were Zoroastrian converts to Islam, the Persian language flourished. On occasion, the Zoroastrian clergy assisted Muslims in attacks against those whom they deemed Zoroastrian heretics.