When the anticipated Prophet appeared and God showed them in...
When the anticipated Prophet appeared and God showed them in him what they expected they took a hostile attitude towards him and rewarded his tolerance with breaching all covenants they signed with him. This religious minority evidently was expecting the new Prophet to share with them their hostile attitude towards the Messiah and his followers. When they found the Holy Qur'an spoke of the holiness of Jesus his truthfulness and the purity of his mother they turned against the Messenger.
Probably they did not like something else in Islam. This faith prohibits usury and stands against exploitation and monopoly of the market. This frightened them because it was their way to charge high interests on their loans to their neighbors. The anarchy which was prevalent in the Arabic Peninsula was a fertile land for them. They were able to move between the tribes seeding and growing hostilities between them.
Establishing a strong government with definite rules and regulations would deprive them of benefits they were enjoying. This religious minority chose to join the pagan camp in order to keep the Arab nation in a state of ignorance poverty and injustice where people lacked security of life honor and property.
Like pagans this minority did not like to see the Arab nation exercising its right of establishing a government unifying the Arab communities and directing them along with other nations to the Creator of the Universe. This religious minority represented to the new Muslim State a menace equal to that of the pagan tribes.
The reader may remember that a delegation from this religious minority was able to mobilize at the Battle of the Moat ten thousand fighters from Mecca and other communities through their war propaganda. You may remember also that Banu Quraidhah (from this minority) broke their covenant with the Holy Prophet. They joined his enemies when they witnessed the pagan army having the upper hand at that battle maximizing the biggest crisis he ever faced.
The Messenger punished Banu Quraidhah severely after the withdrawal of the Confederate Army from around Medina. He made them pay dearly from their blood and wealth for their flagrant crimes. However the bulk of this minority was settling in Kheibar and its numerous fortresses which were about eighty miles from Medina.