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The article discusses Sa'd ibn Ubadah, a leader of the Khazraj tribe, and the spread of Islam in Medina, highlighting the importance of the Quraysh lineage in Islamic leadership. Sa'd ibn Ubadah's refusal to pledge allegiance to Abu Bakr was not due to personal ambition. The Khazraj tribe's allegiance to Abu Bakr demonstrates the transformation of tribalism by Islam and the unity of the Muslim community.