Sunnah or Sunna (سنة, plural سنن sunan), is an Arabic word that means "habit" "way" or "usual practice". Within the context of Islam it refers to the words and actions or example of Prophet Muhammad, who is known to them as al-Insān al-Kāmil (the perfect human) and uswa hasana (an excellent model of conduct).
Even the most insignificant of actions on his part (found therein) have a drastic effect upon Islamic doctrines and laws, as the Qur'an and Sunnah collectively form the Shari'ah.
Bid'ah (innovation) is forbidden, and the closer one emulates Muhammad's behavior the more pious they are considered.
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