hadith
304
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Imam Ali (AS) said, The order of humanity is based on righteous brotherhood and the order of religion is based on unshakable certainty.
الإمامُ عليٌّ (عَلَيهِ الّسَلامُ) : نِظامُ المُرُوَّةِ حُسْنُ الاُخُوَّةِ وَ نِظامُ الدّينِ حُسنُ اليَقينِ