Fabricated report — not an established saying of the Prophet ﷺ
عَلِيٌّ خَيْرُ الْبَشَرِ مَنْ شَكَّ فِيهِ كَفَرَ
Translation of the wording: “ʿAlī is the best of humankind; whoever doubts this has disbelieved.”
This wording illustrates false attribution. Its claim is not being taught as a valid belief or applied as a judgement on anyone.