A major lesson contained in Hadith 16 of an-Nawawi is
The correct answer is: D
Explanation
Hadith 16
On the authority of Abu Hurayrah (may Allah be pleased with him): A man came to the Prophet (peace and blessings of Allah be upon him) and said, "Advise me" He [the Prophet (peace and blessings of Allah be upon him) said, "Do not become angry" The man repeated [his request] several times and he [the Prophet (peace and blessings of Allah be upon him) said, "Do not become angry".