Concept:Hadith 16 of an-Nawawi teaches the importance of controlling one's anger in Islam.
Explanation:Imam an-Nawawi recorded a hadith in which a man asked the Prophet (peace be upon him) for advice.
The Prophet (peace be upon him) replied: "Do not become angry."
The man repeated the request several times, and the Prophet (peace be upon him) gave the same answer each time.
This repetition emphasises that anger is a harmful emotion that can lead a believer into sin.
Overcoming anger requires patience, self-restraint, and continuous effort.
Thus, the main lesson from this hadith is that a Muslim should develop the ability to control his or her anger.
Answer:B. ability to control anger