Everything authentically narrated concerning the Prophet's complexion and the rest of his physical features is also included in the definition of sunnah. Umm Ma'bad described what she saw of the great Prophet (pbuh). She said:
"I saw a man, his face radiant with a bright glow, not too thin or too fat, elegant and handsome. His eyes had a deep black hue with long eyelashes. His voice was pleasant and his neck long. He had a thick beard. His long black eyebrows were beautifully arched and connected to each other. In silence, he remained dignified, commanding utmost awe and respect. When he spoke, his speech was brilliant. Of all people he was the most handsome and the most pleasant, even when approaching from a distance. In person, he was unique and most admirable. Graced with eloquent logic, his speech was moderate. His logical arguments were well organized as though they were a string of gems. He was not too tall or too short, but exactly in between. Among three, he appeared the most radiant and most vibrant. He had companions who affectionately honored him. When he spoke, they listened to him attentively. When he gave orders, they were quick to execute them. They rallied around him guarding him. He never frowned or spoke frivolously." [Hakim]Along with his physical features, his Companions also described his habits and behavior with people. Once Anas reported:
"I served the Prophet of Allah (pbuh) for ten years. Never once did he so much as express any bit of displeasure nor did he ever ask 'Why did you do it?' for something I did or 'Why didn't you do it?' for something I didn't do."From the above we can clearly see that when the term sunnah appears in a general context refering to Prophet Muhammad (pbuh) it comprises anything narrated about the Prophet (pbuh) and authentically traced to him. Once a Muslim learns of the authenticity of any narration, he/she is obliged to follow and obey it accordingly. Such obedience is mandated by Allah as He declares
"...and obey Allah and His Prophet and do not turn away when you hear (him speak)." [8:20]At times, some Muslims are perplexed when people say that sunnah is something only recommeded and is not mandatory. Thus they conclude that we are only required to follow the Qur'an and not the Sunnah. Such an argument results from a gross misunderstanding. Scholars of Islamic jurisprudence use the term sunnah to denote what is authentically established of Prophet Muhammad (pbuh) in deeds which were not subsequentlly made mandatory by Allah.
They further hold that this includes any saying of Prophet Muhammad (pbuh) where he encourages Muslims to do a particular task and compliments those who imbibe such attributes. Thus to them, the term sunnah denotes what is authentically established of Prophet Muhammad (pbuh) in deeds which he did voluntarily and which were not subsequently made mandatory by Allah. They further hold that this includes any saying of Prophet Muhammad (pbuh) where he encourages Muslims to do a particular task and compliments those who imbibe such attributes. Thus to them, the term sunnah refers to what is "recommended" and is not mandatory (fard or wajib).
From the above, we can clearly see that the term sunnah takes on different meanings when used by different Islamic disciplines.