The Encyclopaedia of Islam. New Edition. Brill, Leiden. Bd. 4, S. 1137: "Montgomery Watt has drawn attention to the fact that the Banu'l-Naḍīr, driven out of Medina, had taken refuge in Khaybar and that their chieftains and the chieftains of other Jewish groups, eager for revenge, were intriguing against Muhammad, along with the Arabs tribes of the neighbourhood. So Muhammad had not only a just motive for attacking them, but there was also the positive necessity to destroy these enemies, more formidable even than the Quraysh, because of their adherence to their own religion, their intelligence and their superior culture. [...] The sources give support to the view of Montgomery Watt, showing that the Jews, already responsible for the coalition which had laid siege to Medina in 5 A.H. and worried by the growing power of the Prophet, continued to stir up the Arabs against him."
Siehe auch W. Montgomery Watt: Muhammad. Prophet and Statesman. Oxford University Press, 1962. S. 189 sowie derselbe: Muhammad at Medina. Oxford University Press, 1962. S. 217 f.
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Rudi Paret: Mohammed und der Koran. Geschichte und Verkündung des arabischen Propheten. Kohlhammer, 2001. S.128
Norman A. Stillman: The Jews of Arab Lands. A History and Source Book. The Jewish Publication Society of America, 1979. S. 18: "The Muslims had been disappointed by the Prophet's recent abortive attempt to make a pilgrimage to Mecca and by signing a truce with the Quraysh at al-Ḥudaybiyya. They needed a victory to raise their spirits."; The Encyclopaedia of Islam. New Edition. Brill, Leiden. Bd. 4, S. 1137: "...if he conquered Khaybar he would be able to satisfy with ample booty those of his companions who, having hoped to capture Mecca, were disappointed and discontented."
Bernard Lewis: Die Juden in der islamischen Welt. Vom frühen Mittelalter bis ins 20. Jahrhundert. Beck, 2004. S. 20
Philipp Peyman Engel: Hass gegen Juden: Das Schweigen unserer Muslime ist kaum zu überhören. In: Die Welt. 27. Dezember 2017 (welt.de [abgerufen am 14. Mai 2021]).