Proper noun
Mihna
(historical) A religious inquisition launched by the caliph al-Ma'mun in the ninth century, which attempted to enforce the minority view that the Qur'an was a creation of God rather than being coeternal with God.
Al-Ma'mun introduced the Mihna with the intention to centralize religious power in the caliphal institution and test the loyalty of his subjects. Source: Internet
The Mihna subjected traditionalist scholars with social influence and intellectual quality to imprisonment, religious tests, and loyalty oaths. Source: Internet