The Heights - 7:165
When they ignored and forgot what they were reminded of, We saved those who fought against evil, and We seized those who did wrong with a terrible torment for their transgression.
How did the Children of Israel forget what they were reminded of?
The Women/4:154
"We raised Mount Sinai above them, and We said to them, "Enter humbly through the gate."We said to them, "Do not transgress the prohibition of Saturday"; and We took from them a firm promise."
The Women/4:155
"Allah sealed their understanding because of their breaking their word, because they disbelieved in the signs and proofs of Allah, because they killed the prophets unjustly, and because they said: "We are fixed-minded", yes, because of their disbelief. Therefore few of them believe."
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.