Shia identity and exclusive allegiance to Imams
Ṣifāt al-Shīʿa|Volume 1|Book 1|Chapter 4
حَدَّثَنَا مُحَمَّدُ بْنُ عَلِيٍّ مَاجِيلَوَيْهِ رَحْمَةُ اَللَّهِ عَلَيْهِ قَالَ حَدَّثَنِي عَمِّي مُحَمَّدُ بْنُ أَبِي اَلْقَاسِمِ عَنْ مُحَمَّدِ بْنِ عَلِيٍّ اَلْكُوفِيِّ عَنْ مُحَمَّدِ بْنِ سِنَانٍ عَنِ اَلْمُفَضَّلِ بْنِ عُمَرَ قَالَ قَالَ اَلصَّادِقُ ع كَذَبَ مَنْ زَعَمَ أَنَّهُ مِنْ شِيعَتِنَا وَ هُوَ مُتَمَسِّكٌ بِعُرْوَةِ غَيْرِنَا.
4. Mohammed bin Ali Majilwayh, May Allah have mercy upon him, narrated to us from his uncle Mohammed bin Abi al-Qasim from Mohammed bin Ali al-Kufi from Mohammed bin Sinan from al-Mufaddhal bin Umar that Imam as-Sadiq عليه السلام said: "He who claims being one of our Shia while adhering to the rope of others has lied."