٥ـ مُحَمَّدُ بْنُ يَحْيَى عَنْ أَحْمَدَ بْنِ مُحَمَّدٍ عَنْ إِسْمَاعِيلَ بْنِ سَهْلٍ عَنْ حَمَّادٍ عَنْ رِبْعِيٍّ قَالَ قَالَ أَبُو عَبْدِ الله (عَلَيهِ السَّلام) قَالَ أَمِيرُ الْمُؤْمِنِينَ (صَلَّى اللهُ عَلَيْهِ وآلِه) إِنَّ التَّفَكُّرَ يَدْعُو إِلَى الْبِرِّ وَالْعَمَلِ بِهِ. 
5. Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad from Isma’il ibn Sahl from Hammad from Rib’ I who has said the following: “Abu ‘Abd Allah  has said that Amir al-Mu’minin (Ali ibn abu Talib)  has said, ‘Thinking leads to virtue and to acting virtuously.’” 