[2/2] Usul al-Kafi: Muhammad b. Yahya from Ahmad b. Muhammad b. Isa from Ibn Fadhal from al-Hasan b. Jahm who said: I heard al-Ridha عليه السلام saying: the friend of every man is his intellect, and his enemy is his ignorance.

[2/2] اصول الكافي: محمد بن يحيى، عن أحمد بن محمد بن عيسى، عن ابن فضال، عن الحسن بن الجهم قال: سمعت الرضا عليه السلام يقول: صديق كل امرء عقله، وعدوه جهله