Usul al-Kafi
Book 5:
The Book of Belief and Disbelief

Chapter55
Clemency and tolerance

796. 3. Imam Zainul Abideen (p): I am pleasantly surprised at the person who in times of anger acts with clemency and tolerance.(B5,C55,T3)

797. 4. Imam Muhammad al-Baqir (p): One who possesses forbearance and modesty earns the pleasure of God.(B5,C55,T4)
798. 5. Prophet Muhammad (p): God never bestows honour on the ignorant and never subjects a forbearing and tolerant person to disgrace.(B5,C55,T5)

799. 6. Imam Jafar as-Sadiq (p): Clemency is enough to help you. If you are not clement, become one.(B5,C55,T6)
800. 8. Prophet Muhammad (p): God likes a believer who is modest, forbearing and saves himself from evil deeds.(B5,C55,T8)