The Banu Sa'd (Arabic: بنو سعد / ALA-LC: Banū Saʿd) was one of the leading royal tribes of Arabia during the Islamic prophet Muhammad's era. They were a subgroup of the larger Hawazin tribal confederation. They had close family relations with Muhammad. They were great warriors and fought many battles with Muhammad against enemies of Islam. ^{[citation needed]} Halima Sadia, Muhammad's wet nurse, belonged to this tribe.^[1]