In Sermon (64), Imam Ali (a.s.) provided crucial teachings on warfare during the Battle of Siffin. This sermon was delivered at a time when a significant group of Muslims was engaged in conflict with the forces of Syria. The Imam urged his companions to make the fear of God their banner, to approach the battlefield with tranquility and dignity. This serves as an essential lesson that even in the midst of war, one must maintain their morals and faith.

Imam Ali (a.s.) also instructed his companions to complete their armor and to shake their swords well in their sheaths before drawing them. This emphasizes the importance of thorough preparation in warfare. He advised them to keep an eye on the enemy with sidelong glances and to strike with spears from both sides. This strategy reflects the need for both mental and physical readiness in battle.

The Imam encouraged repeated attacks and instilled a sense of shame in fleeing from the battlefield. This moral lesson highlights that one should never retreat out of fear, especially when standing for the truth. He reassured them that Allah is with them and will not let their deeds go to waste, which serves as a great comfort that divine support always accompanies the truth.

This sermon teaches us that in every aspect of life, be it warfare or any other challenge, we should have faith in Allah's assistance and remain steadfast based on our beliefs. It not only discusses strategies for war but also emphasizes the importance of human ethics and faith in God.