BENEFITS OF NASEEHAH

i) It purifies the one being advised from some weakness. When one sees a fellow Muslim negligent in performing a good deed, or committing some wrong, he should take it upon himself to mend the shortcoming. The shortcoming may pertain to the rights of Allah or to the rights of His slaves.
ii) When a believer gives naseehah to his brother in Islaam, he helps him in a matter in which his brother has erred because the believer loves for his brother what he loves for himself.
iii) When a believer gives naseehah to his brother, he is disposing of the right that his brother has upon him. Just as you would not like to see a fault in yourself, and would work to remove it, likewise, you should not like to see that fault in your brother. You must hate to see in him what you hate to see in yourself, hence, you should give him naseehah to remove that fault as you would have liked to receive naseehah to have that fault removed from you. Give your brother naseehah and guide him toward goodness, and take him away from harm.Giving naseehah is a sign of true brotherhood, a way of bringing the hearts closer, and of closing the doors of hatred and suspicion. This is why Umar ibn Abdul-Aziz said, "The one who grants naseehah to his brother in matters of this his religion and concerns himself with mending affairs of this life; then, he has granted an excellent gift and fulfilled a wajib that was due on him..." If someone were to ask, "How is naseehah a right of brotherhood, when one's faults are mentioned?" the answer is not to feel apprehension when your brother informs you of your faults. He may know something that perhaps you are unaware of, and is compelled to tell you about it out of sheer compassion. It is a way of winning over the hearts of those who are endowed with insight.
Shaitaan has declared war on all of humanity, and Allah has given the believers the tools necessary to win this war. Informing each other of ugly deeds we perform, or about loathsome characteristics that we may have is like pointing out where the land mines are on a battlefield. By pointing out these hidden dangers, we help to keep each other from destruction. In this war of conquering the self, the help, aid and guidance of our brothers and sisters is needed to assure that ultimate victory, insha'Allah, of true success in this life and in the Hereafter.