Al-Kāfi
Hadith 4 3ـ أَحْمَدُ بْنُ إِدْرِيسَ عَنْ مُحَمَّدِ بْنِ عَبْدِ الْجَبَّارِ عَنْ بَعْضِ أَصْحَابِنَا رَفَعَهُ إِلَى أَبِي عَبْدِ الله (عَلَيْهِ السَّلام) قَالَ قُلْتُ لَهُ مَا الْعَقْلُ قَالَ مَا عُبِدَ بِهِ الرَّحْمَنُ وَاكْتُسِبَ بِهِ الْجِنَانُ قَالَ قُلْتُ فَالَّذِي كَانَ فِي مُعَاوِيَةَ فَقَالَ تِلْكَ النَّكْرَاءُ تِلْكَ الشَّيْطَنَةُ وَهِيَ شَبِيهَةٌ بِالْعَقْلِ وَلَيْسَتْ بِالْعَقْلِ.
3. Ahmad ibn ’Idris has narrated from Muhammad ibn ‘Abd al-Jabbar, from one of our people in a marfu’ manner that Abu 'Abdillah (al-Sadiq) (as) was asked, 'What is intellect (al-'Aql)?'. He said, ‘It is what someone worships ar-Rahman with and attains paradise.’ I then asked, 'What was the thing within Mu'awiya?'. He replied, ‘That was heinousness, that was devilry and it is similar to the intellect but it is not intellect.’