Musnad Ahmad 599
It was narrated that Abu Juhaifah said:
We asked ‘Ali (رضي الله عنه): Do you have something from the Messenger of Allah (ﷺ) apart from the Qur`an? He said: No, by the One who split the seed and created the soul, except the understanding that Allah, may He be glorified and exalted, helps a person to acquire of the Qur`an or what is in the document.I said: What is in the document? He said: Diyah (blood money), ransom of prisoners and muslim should be killed in retaliation for a kafir.
حَدَّثَنَا سُفْيَانُ، عَنْ مُطَرِّفٍ، عَنِ الشَّعْبِيِّ، عَنْ أَبِي جُحَيْفَةَ، قَالَ سَأَلْنَا عَلِيًّا رَضِيَ اللَّهُ عَنْهُ هَلْ عِنْدَكُمْ مِنْ رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ شَيْءٌ بَعْدَ الْقُرْآنِ قَالَ لَا وَالَّذِي فَلَقَ الْحَبَّةَ وَبَرَأَ النَّسَمَةَ إِلَّا فَهْمٌ يُؤْتِيهِ اللَّهُ عَزَّ وَجَلَّ رَجُلًا فِي الْقُرْآنِ أَوْ مَا فِي الصَّحِيفَةِ قُلْتُ وَمَا فِي الصَّحِيفَةِ قَالَ الْعَقْلُ وَفِكَاكُ الْأَسِيرِ وَلَا يُقْتَلُ مُسْلِمٌ بِكَافِرٍ‏.‏