Sunnah in this sense is mentioned in the hadith of the Messenger of Allah (peace and blessings be upon him) in which he said, “Whosoever does a good Sunnah will get the reward for it and the reward of others who followed him in doing the same thing until the Day of Judgment. And whosoever does a bad Sunnah will have the punishment of doing it and the punishment of others who followed him in practicing it.” (Muslim)
However, the definition of Sunnah differs depending on the area of Shari`ah. For example, a scholar in the area of Usul al-Fiqh (Arabic for: fundamental principles of Islamic jurisprudence) will define Sunnah as “whatever the Prophet was reported to have said, did, or permitted others to do.”
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