Mishkat al-Masabih
Abu Juhaifa said he asked ‘Ali whether he had any instruction not contained in the Qur’an and he replied, “By Him who split the seed and created the soul, I have nothing but what is in the Qur’an, except understanding which a man is given regarding His Book and what is in the document.” He asked him what the document contained, and he replied, “Blood wit, the setting free of a prisoner, and that a Muslim should not be killed for an infidel.” Bukhari transmitted it.
وَعَن أبي جُحيفةَ قَالَ: سَأَلْتُ عَلِيًّا رَضِيَ اللَّهُ عَنْهُ هَلْ عِنْدَكُمْ شَيْءٌ لَيْسَ فِي الْقُرْآنِ؟ فَقَالَ: وَالَّذِي فَلَقَ الْحَبَّةَ وَبَرَأَ النَّسَمَةَ مَا عِنْدَنَا إِلَّا مَا فِي الْقُرْآنِ إِلَّا فَهْمًا يُعْطَى رَجُلٌ فِي كِتَابِهِ وَمَا فِي الصَّحِيفَةِ قُلْتُ: وَمَا فِي الصَّحِيفَةِ؟ قَالَ: الْعَقْلُ وَفِكَاكُ الْأَسِيرِ وَأَنْ لَا يُقْتَلَ مُسْلِمٌ بِكَافِرٍ. رَوَاهُ الْبُخَارِيُّ
Reference