Chapter 2: Surat Al-Baqarah (The Cow), verses 84-86

Translation:
And when We made a covenant with you We said: ‘You shall not shed your kinsmen’s blood or turn them out of their dwellings. To this you consented and bore witness. Yet there you were, slaying your own kinsfolk, and turning a number of them out of their dwellings, and helping each other against them with sin and aggression. Though had they come to you as captives, you would have ransomed them. Surely their expulsion was unlawful. Do you then believe in one part of the Scriptures and deny another? Those of you that act thus shall be rewarded with disgrace in this world and with the most grievous punishment (on the Day of Resurrection). God is watching over all your actions. Such are they who buy the life of this world at the price of the life to come. Their punishment shall not be lightened, nor shall they be helped.
Tafsir
(Commentary):
Before the
advent of Islam, three Jewish tribes inhabited the area around Medina: Banu
Nadheer, Banu Quraiza, and Banu Qainqa’a. Despite the fact that all of them
adhered to Mosaic law, ignorant prejudices had divided them into two groups.
They had become enmeshed, along with the polytheist tribes of Medina—Aus and
Khazraj—in political manoeuvering. Banu Nadhir and Banu Quraiza had aligned
themselves with the Aus tribe, and the Banu Qainqa’a with the Khazraj. Split
into separate camps in this manner, the three Jewish tribes were constantly at
war with one another. In the Battle of Bua’ath, for instance, which occurred
five years before the Prophet’s emigration to Medina, Jew had fought Jew
alongside their rival Arab allies, killing their co-religionists and expelling
them from their homes. Then, when hostilities ceased, they used to appeal for
funds to ransom their brethren who had been taken captive by the pagan Arabs.
Such action, they would say, had been laid down in the Torah. They were willing
to break God’s commandments in regard to the life and property of other Jews.
Then they would adopt a humanitarian posture on behalf of the victims of their
own cruelty, all the while seeking to clothe their self-interested politics in a
cloak of piety.