The Women - 4:161
Because they practiced usury when they were forbidden to do so, and ate the people´s money unjustly... We prepared for their disbelievers a painful torment.
An example of eating the people's money unfairly:
The Cow/2:188
Do not eat your money unjustly among yourselves. And do not bribe officials/managers with the intention of taking the people´s money unjustly.
The Defrauding/83:1
Woe to those who deceive.
The Defrauding/83:2
When they take from the people, they measure exactly.
The Defrauding/83:3
And when they give, they keep the measure and the weighing incomplete.
The Heights/7:85
"And We sent to Median their brother Shu´ayb. He said: "O My people, worship Allah. You have no gods besides Him. A clear proof has come to you from your Lord. Measure and weigh exactly. Do not eat the people´s right. Do not make corruption in the earth after it has been leveled. This is better for you if you believe."