Fighting in the way of Allah
مُحَمَّدُ بْنُ يَحْيَى عَنْ أَحْمَدَ بْنِ مُحَمَّدٍ عَنْ مُحَمَّدِ بْنِ يَحْيَى عَنْ طَلْحَةَ بْنِ زَيْدٍ عَنْ أَبِي عَبْدِ اللَّهِ ( عليه السلام ) عَنْ أَبِيهِ ( عليه السلام ) قَالَ قَرَأْتُ فِي كِتَابٍ لِعَلِيٍّ ( عليه السلام ) أَنَّ رَسُولَ اللَّهِ ( صلى الله عليه وآله ) كَتَبَ كِتَاباً بَيْنَ الْمُهَاجِرِينَ وَ الْأَنْصَارِ وَ مَنْ لَحِقَ بِهِمْ مِنْ أَهْلِ يَثْرِبَ أَنَّ كُلَّ غَازِيَةٍ غَزَتْ بِمَا يُعَقِّبُ بَعْضُهَا بَعْضاً بِالْمَعْرُوفِ وَ الْقِسْطِ بَيْنَ الْمُسْلِمِينَ فَإِنَّهُ لَا يَجُوزُ حَرْبٌ إِلَّا بِإِذْنِ أَهْلِهَا وَ إِنَّ الْجَارَ كَالنَّفْسِ غَيْرَ مُضَارٍّ وَ لَا آثِمٍ وَ حُرْمَةَ الْجَارِ عَلَى الْجَارِ كَحُرْمَةِ أُمِّهِ وَ أَبِيهِ لَا يُسَالِمُ مُؤْمِنٌ دُونَ مُؤْمِنٍ فِي قِتَالٍ فِي سَبِيلِ اللَّهِ إِلَّا عَلَى عَدْلٍ وَ سَوَاءٍ
Muhammad Bin Yahya, from Ahmad Bin Muhammad, from Muhammad Bin Yahya, from Talha Bin Zayd,
(It has been narrated) from Abu Abdullah-asws, from his father-asws having said: ‘I-asws read in the Book of Ali-asws that Rasool-Allah-saww wrote an ordinance between the Emigrants and the Helpers and the one who attaches with them from the people of Yasrab that: ‘Every combatant who combats must be with step by step with the enjoining of the good and the equity between the Muslims, for a war is not allowed except by the permission of its rightful ones, and that the neighbour is like the self without harm and sin; and the sanctitiy of the neighbour upon the neighbour is like the sanctity of his own mother and his own father.
No Believer should make peace besides a Believer during the fighting in the Way of Allah-azwj except upon justice and equality’.[1]
[1] Al Kafi – V 5 – The Book of Jihaad Ch 9 H 5