Since at least the 10th century, Sunnis have incessantly attacked Shia for their perceived espousal of Quranic distortion and regard it as one of the most blatant examples of Shia "heresy".[15] When 11th century Muslim scholar Ibn Hazm argued the Muslim claim that the gospels had been corrupted, one Christian counter-argument was "that the Rawafid maintain that the Companions of your Prophet altered the Koran by way of omissions and additions." This accusation of tabdil (alteration)—a result of Shi'ite distrust towards the companions—was scathingly refuted by Ibn Hazm.[2]