https://www.answering-islam.org/Authors/Arlandson/qurayza_jews.htm
In AD 627, Muhammad committed an atrocity against the last remaining major tribe of Jews in Medina: the Qurayza.
He beheaded the men and the pubescent boys and enslaved the women and children. In doing this, he wiped an entire tribe "off the map" to use the language of the President of Iran, recently.
The purpose of this article is full disclosure and straightforward analysis about early Islam. How and why did this atrocity unfold?
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It is important to know contemporary Arabs believe Jews betrayed Mohammed and he was thus justified in the massacre. The ambivalent view of Muslims to Jews that they are enemies and yet need to be protected and also degraded.
The original cause for hatred was the expectation that Jews would accept him as the prophet. And he never forgave the Jews when they rejected him. Not much different than the Christian view that Jews killed their god and failed to accept him. Nonetheless in general Muslims have been better to their inferior and degraded cousins than have been the Christians