"I said to 'Ali: O Commander of the Believers! Do you have anything written that is not in Allah's Book?' He said: 'By the One Who splits the seed and creates the soul, I have not learned from it except what understanding of the Qur'an Allah gives to a man, and what is in this sheet of paper.' I said: 'What is in the paper?' He said: 'It is the 'Aql, the (ransom for) release of captives, and the judgement that no believer is killed for a disbeliever.'" (Using translation from Tirmidhī 1412)   

قُلْتُ لِعَلِيٍّ يَا أَمِيرَ الْمُؤْمِنِينَ هَلْ عَلِمْتَ شَيْئًا مِنَ الْوَحْيِ إِلَّا مَا فِي كِتَابِ اللَّهِ تَعَالَى؟ قَالَ «لَا وَالَّذِي فَلَقَ الْحَبَّةَ وَبَرَأَ النَّسَمَةَ مَا أَعْلَمُهُ إِلَّا فَهْمًا يُعْطِيهِ اللَّهُ الرَّجُلَ فِي الْقُرْآنِ وَمَا فِي الصَّحِيفَةِ» قُلْتُ وَمَا فِي الصَّحِيفَةِ؟ قَالَ «الْعَقْلُ وَفِكَاكُ الْأَسِيرِ وَلَا يُقْتَلُ مُسْلِمٌ بِمُشْرِكٍ»