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Wikipedia
The term ( meaning "the companions", from the verb meaning "accompany", "keep company with", "associate with") refers to the companions, disciples, scribes and family of the Islamic prophet Muhammad. This form is definite plural; the indefinite singular is masculine sahabi (), feminine sahabia ().
Later scholars accepted their testimony of the words and deeds of Muhammad, the occasions on which the Quran was revealed and various important matters of Islamic history and practice. The testimony of the companions, as it was passed down through trusted chains of narrators ( isnads), was the basis of the developing Islamic tradition. From the traditions ( hadith) of the life of Muhammad and his companions are drawn the Muslim way of life ( sunnah), the code of conduct ( sharia) it requires, and the jurisprudence ( fiqh) by which Muslim communities should be regulated. The two largest Islamic denominations, the Sunni and Shia, take different approaches in weighing the value of the companions' testimony, have different hadith collections and, as a result, have different views about the Sahabah.