The Table Spread - 5:32
Therefore We wrote to the Children of Israel: Whoever kills a person who has not committed murder or corrupted the earth, it is as if he had killed all mankind. And whoever gives life to that soul, it is as if he had given life to all mankind. Our messengers came to them with clear proofs. Nevertheless, most of them immediately began to commit transgression in the earth.
The Children of Israel broke their promise to Allah:
The Cow/2:83
We took a promise from the Children of Israel: You shall serve none but Allah, and you shall do good to parents and relatives and orphans and the poor. You shall speak to people in friendship. You will observe the prayer and pay the zakat. But after that you turned away, except a few of you.
The Cow/2:84
We had also taken a promise from you that you would not shed each other´s blood and would not drive each other out of their homes. You had accepted this and were witnesses to it.
The Cow/2:85
After all this, you still kill one another and drive out a group of you from their homes and unite against them in evil and enmity. It is already forbidden for you to drive them out of their homes, and as if that were not enough, when they are captured by you, you demand ransom from them. Or do you believe in part of the Book and disbelieve in part of it? What is the recompense for those who do so but disgrace in the life of this world and the harshest of torments on the Day of Resurrection? Allah is not heedless of what you do.