Sahaba or As-Sahaba (Arabic: الصحابة), meaning the companions, refers to the companions, friends and family of the Islamic prophet, Muhammad. They are highly respected by Muslims and after saying any name of a sahabi, muslims usually say Radhiya llahu anhu (Arabic: رضي الله عنه), meaning "well-pleased is Allah with them".
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Muhammad and his companions on an Ottoman miniature
Sahaba Facts for Kids. Kiddle Encyclopedia.