Sunnah () means “way” or “custom”, and therefore, the sunnah of the prophet means “the way of the prophet”, or what is commonly known as the Prophet’s traditions. Terminologically, the word ‘Sunnah’ in Sunni Islam means the deeds, sayings and approvals of Muhammad during the 23 years of his ministry, and this means that whatever he did during his ministry as a prophet and messenger of Allah is considered a sunnah, which Muslims received through consensus of companions of Muhammad (Sahaba). In Shiah Islam, the word 'Sunnah' means the deeds, sayings and approvals of Muhammad and the twelve Imams who Shi'a Muslims believe were chosen by Allah to succeed the prophet and to lead mankind in every aspect of life.
The prophetic example of Sunnah is considered to be obligatory by most Muslims. A few Qur'an Alone Muslims follow only the Qur'an and reject all sunnah and hadith as sources for Divine Guidance or religious law. Many advocates of liberal movements within Islam claim that prophetic sunnah should be followed in matters of ritual and worship, but may be questioned in the case of Islamic law.
Through research on the transmitters of Hadith (isnad), scholars of the science of Hadith came up with the system of knowing the different categories of Hadith, and how to evaluate the text (matn) in order to establish if the text is correct, good, weak, or false. There is a tradition both of historical biography (Ilm ar-Rijal) of Muhammad and of validating hadith — isnad or “backing”.
42:48 "You (Mohammad) have NO duty EXCEPT DELIVERING the message."
13:40 "(Mohammad) Your ONLY duty is delivering, we will call them to account."
5:99 "The messenger (Mohammad) has NO function EXCEPT delivery of the message."
Furthermore, they observe Mohammad's only message as the Qur'an, as per:
21:10 "We have sent down to you a scripture containing YOUR MESSAGE. Do you not understand?"
69:44-46 "Had he (Muhammad) uttered any other teachings. We would have punished him. We would have stopped the revelations to him."
Qur'an Alone Muslims uphold only one sunnah; the Qur'an.
Traditional Muslims however, believe that verses such as "A similar (favour have ye already received) in that We have sent among you an Messenger (Muhammad) of your own, delivering to you Our Verses, and purifying you, and teaching you the Book and the Wisdom, and in new knowledge." (2:151) justify the Sunnah. Many of these sunnah had their roots coming from Abraham as it is mentioned in Quran, "and follow the Nation of Abraham, the monotheist, and he was never one of those who set up partners, and God chose Abraham as his friend" (4:125).
Had the Prophet's only role been to deliver the verses, the remaining parts of the verse: "purifying you, and teaching you the Book and the Wisdom..." would not have been there. The traditional view then holds that all the above verses, in which Muhammad's mission is to deliver the message ONLY, INCLUDES his TEACHING the explanation of the Book (the Quran) and the Wisdom behind it, to the people, not just relate the verses of the Quran and leave.
In addition, the verse:"Ye have indeed in the Messenger of God (Muhammad) the best of examples, for any one whose hope is in God and the Final Day, and who engages much in the Praise and Remembrance of God." (33:21), further emphasizes that Muhammad's example is divinely inspired and to be followed by Muslims.
According to Traditional Muslims, the point being emphasized in the verses quoted by the Quran Alone argument - is that Muhammad is not to be worshipped or deified - and that his role is to deliver the Quran, complete with explanation and guidelines on how to live the Quran - guidelines which have been preserved in his Sunnah.
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