In Letter (4), Imam Ali (peace be upon him) addresses a commander of his army, emphasizing the responsibilities and strategies necessary in times of conflict. This letter was written during a period when the Islamic community faced various challenges and divisions. Imam Ali (a.s.) instructs his followers that if their enemies come under the shadow of obedience, this is what they desire; however, if the situation shifts towards rebellion and disobedience, they should take their obedient followers and stand firm against the disobedient ones.

This letter reflects Imam Ali's (a.s.) commitment to principles and the importance of loyalty among his followers. He stresses that it is far better to focus on those who are loyal rather than be distracted by those who are not. This highlights a profound wisdom: the presence of disloyal individuals can detract from one's strength, while the support of devoted companions can be more beneficial.

The key message in this letter is that true leadership is rooted in loyalty and obedience. If someone is not genuinely with you, their presence can weaken your position. This letter teaches us the importance of adhering to our principles and surrounding ourselves with those who support our cause.

Another significant aspect of this letter is that Imam Ali (a.s.) conveys that sometimes strength does not come from the number of supporters but from their loyalty. This spiritual lesson encourages us to always act in accordance with our values and to align ourselves with those who share our beliefs and objectives.