Al-Imam Ali (p.b.u.h), said:

Hadith n. 474

474. Amir al-mu’minin, peace be upon him, said: The fighter in the way of Allah who gets martyred would not get a greater reward than he who remains chaste despite means. It is possible that a chaste person may become one of the angels.

Hadith n. 475

475. Amir al-mu’minin, peace be upon him, said: Contentment is a wealth that does not exhaust.

Hadith n. 476

476. When Amir al-mu’minin, peace be upon him, put Ziyad ibn Abih in place of Abdullah ibn Abbas over Fars (in Persia) and its revenues, he had a long conversation with him in which he prohibited him from advance recovery of revenue. Therein he said: Act on justice and keep aloof from violence and injustice because violence will lead them to forsake their abodes while injustice will prompt them to take up arms.

Hadith n. 477

477. Amir al-mu’minin, peace be upon him, said: The worst sin is that which the committer takes lightly.

Source: https://www.al-islam.org/nahjul-balagha-part-2-letters-and-sayings