The Banu Nadeer were a Jewish tribe who had their settlement outside Madina. The Holy Prophet had given them a charter of freedom and they were expected to be loyal to the Muslims. They however indulged in activities prejudicial to the interests of the Muslims. Kaab b Ashraf a notorious poet of the tribe composed lampoons satiring Islam and the Holy Prophet. He visited Makkah and wrote elegies commemorating the death of the Quraish who had fallen in the Battle of Badr. Kaab was killed by a Muslim young man and the Jews felt bitter at his death. Another Jew of Banu Nadeer, Abu Raafi' Sallarn incited the Arab tribes of Sulaim and Ghatfan to rise against the Muslims.