You are looking for the Sunnah.
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Knowledge of the Sunnah comes primarily from the hadiths ("reports") about Muhammad's life, which were passed down orally until codified in the eighth century AD, some hundred years after Muhammad's death. The hadiths comprise the most important body of Islamic texts after the Quran; they are basically a collection of anecdotes about Muhammad's life believed to have originated with those who knew him personally.
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