Al-Baghdaadi, may Allah have mercy upon him, said in Al-Farq bayn Al-Firaq, “You, may Allah please you, should know that the effect of Al-Baatiniyyah is more adverse and harmful on all Muslim groups than that of the Jews, Christians and Magians. Rather, it is more destructive than Ad-Dahriyyah and all the other sects of disbelievers.” Al-Baatiniyy..
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