Commander of Faithful – an Exclusive Title of Imam Ali-asws
مُحَمَّدُ بْنُ يَحْيَى عَنْ جَعْفَرِ بْنِ مُحَمَّدٍ قَالَ حَدَّثَنِي إِسْحَاقُ بْنُ إِبْرَاهِيمَ الدِّينَوَرِيُّ عَنْ عُمَرَ بْنِ زَاهِرٍ عَنْ أَبِي عَبْدِ اللَّهِ ( عليه السلام ) قَالَ سَأَلَهُ رَجُلٌ عَنِ الْقَائِمِ يُسَلَّمُ عَلَيْهِ بِإِمْرَةِ الْمُؤْمِنِينَ قَالَ لَا ذَاكَ اسْمٌ سَمَّى اللَّهُ بِهِ أَمِيرَ الْمُؤْمِنِينَ ( عليه السلام ) لَمْ يُسَمَّ بِهِ أَحَدٌ قَبْلَهُ وَ لَا يَتَسَمَّى بِهِ بَعْدَهُ إِلَّا كَافِرٌ قُلْتُ جُعِلْتُ فِدَاكَ كَيْفَ يُسَلَّمُ عَلَيْهِ قَالَ يَقُولُونَ السَّلَامُ عَلَيْكَ يَا بَقِيَّةَ اللَّهِ ثُمَّ قَرَأَ بَقِيَّتُ اللَّهِ خَيْرٌ لَكُمْ إِنْ كُنْتُمْ مُؤْمِنِينَ
Muhammad Bin Yahya, from Ja’far Bin Muhammad who said, ‘Is’haq Bin Ibrahim Al Deynouwary narrated to me, from Umar Bin Azhir,
(It has been narrated) from Abu Abdullah-asws, that a man asked him-asws about Al-Qaim-ajfj, ‘Can one greet upon him-ajfj as ‘Amir Al-Momineen’?’ He-asws said: ‘No, that is a name which Allah-azwj Named Amir Al-Momineen-asws with.
‘No one has been named with it before him-asws, nor would anyone be named with it after him-asws except for ‘كَافِرٌ’ an Infidel’. I said, ‘May I be sacrificed for you-asws! How should one greet upon him-ajfj?’ He-asws said: ‘They should be saying, ‘The greetings be upon you-ajfj, O Remaining one of Allah-azwj! (يَا بَقِيَّةَ اللَّهِ)’. Then he-asws recited [11:86] The Remaining one of Allah is better for you if you are Believers’.[1]
[1] Al Kafi V 1 – The Book Of Divine Authority CH 107 H 2