Teacher of Famous Shia scholar Kamal Haydari believes in tahreef of the Quran In a nutshell: They asked him about the authenticity of some Khutbah’s and narrations of Ali Ibn Abi Talib (رضي الله ﺗﻌﺎﻟﯽٰ عنه). FINALLY they asked: “The Hadith Thaqalayn (I leaving you behind Kitaballah and Itrati…) WHAT is meant with THAQL AL AKBAR (the HEAVIER of the two things) is it the QUR’AN or the Ahl AL-BAYT? Answer: The narrations are not authentic.