In December 623, Muslims led by Muhammad defeated the
Meccans of the
Banu Quraish tribe in the
Battle of Badr.
Ibn Ishaq writes that a dispute broke out between the Muslims and the Banu Qaynuqa (the allies of the
Khazraj tribe) soon afterward. When a Muslim woman visited a jeweler's shop in the Qaynuqa marketplace, one of the goldsmiths and the men present began pestering her to uncover her face. She refused, but the goldsmith, who was a Jew, played a trick on her by attaching the hem of her dress to her back, causing some of her legs to be visible when she stood up. A Muslim man then rushed to the goldsmith and killed him, who was at once avenged by his fellows. The Muslim's family asked for help from fellow Muslims against the Jews. Realizing the anger of the Muslims, the Jews retired to their fortress. Hearing this, Muhammad regarded this event as a
casus belli. Western historians, however, do not find in these events the underlying reason for Muhammad's attack on the Qaynuqa. According to
F.E. Peters, the precise circumstances of the alleged violation of the Constitution of Medina are not specified in the sources. According to
Fred Donner, available sources do not elucidate the reasons for the expulsion of the Qaynuqa. Donner argues that Muhammad turned against the Qaynuqa because as artisans and traders, the latter were in close contact with Meccan merchants. Weinsinck views the episodes cited by the Muslim historians, like the story of the Jewish goldsmith, as having no more than anecdotal value. He writes that the Jews had assumed a contentious attitude towards Muhammad and as a group possessing substantial independent power, they posed a great danger. Wensinck thus concludes that Muhammad, strengthened by the victory at Badr, soon resolved to eliminate the Jewish opposition to himself. Muhammad then approached the Banu Qaynuqa, gathering them in the marketplace and addressing them as follows, To which the tribe replied,
Shibli Nomani and Safi al-Mubarakpuri view this response as a declaration of war. According to the Muslim tradition, Ayah were revealed to Muhammad following the exchange. after which the tribe surrendered unconditionally. It was certain, according to Watt, that there was some sort of negotiations. At the time of the siege, the Qaynuqa had a fighting force of 700 men, 400 of whom were armored. Watt concludes, that Muhammad could not have besieged such a large force so successfully without Qaynuqa's allies' support. It was suggested that this invasion was a way for Muhammad to eliminate the tribe from market competition in Medina. After the surrender of Banu Qaynuqa,
Abd Allah ibn Ubayy, the chief of a section of the clan of Khazraj̲ urged him to spare them and drive them away. Because of this interference and other episodes of his discord with Muhammad, Abdullah ibn Ubayy earned for himself the title of the leader of hypocrites (
munafiqun) in the Muslim tradition. ==Aftermath==