I’ve found on wikipedia that we had a number of our scholars who believed in the distortion of the quran like, al kulayni, al shaykh al mufid, qomi, al ayyashi, al sayyari, al tabbarsi and so on. Do we shias believe in any kind of distortion?

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This is a good summary of our beliefs in this issue:

http://en.mobile.wikishia.net/view/Integrity_of_the_Qur%27an