In Sermon (16), when allegiance was given to him in Madinah, Imam Ali (a.s.) declared his responsibility for his words. This sermon was delivered at a pivotal moment when the Muslim community was entering a new phase under his leadership. He emphasized the importance of piety, the consequences of sins, and the distinction between truth and falsehood. He stated that one who reflects on past punishments is restrained by piety from falling into doubts.

He warned that trials similar to those at the time of the Prophet's advent were returning, indicating that people would be turned upside down, and their statuses would change. He likened sins to unruly horses that lead their riders to Hell, while piety was compared to tamed mounts that guide their riders peacefully into Paradise.

Imam Ali (a.s.) clarified the distinction between truth and falsehood, noting that if falsehood becomes prevalent, it is not a new occurrence, and if truth diminishes, it may still prevail despite its scarcity. He advised the people to remain in their homes, resolve their disputes, and turn towards repentance.

A crucial message of this sermon is the importance of recognizing one's value and status, and the necessity of adhering to the path of righteousness to avoid destruction. He stated that those who stand against the truth are doomed, and ignorance is the greatest folly of not understanding one's essence.

In conclusion, Imam Ali (a.s.) urged the people to praise their Lord and blame only themselves, encouraging self-reflection and moral improvement. This sermon teaches us that piety and the recognition of truth are fundamental to our lives.