God says
…. oppression is even worse than killing. … Q2: 191
…they who transgress the bounds set by God -- it is they, they who are evildoers! - Q.2: 229
But he who commits a fault or a sin and throws the blame on an innocent person, burdens himself with the guilt of calumny and [yet another] flagrant sin. - Q.4: 112
Prophet said
1. “God gives respite to the oppressor until when He overtakes him. He (then) does not exempt him.”-- H: Bukhari and Muslim. N: Abu Musa.
2. “Of all the people, remotest from God is the hard hearted”– H: Tirmizi. N: Ibn Omar.
3. “Whoever extorts any portion of land unjustly will be sunk down unto seven earths on the Resurrection Day” – H: Bukhari. N: Salem.
4. “The poor man among my people is he who will come on Resurrection Day with prayer, fasting, and almsgiving (on the one hand and on the other, with) rebuking, backbiting, devouring the property, shedding the blood, and beating someone.”-- H: Muslim. N: Abu Hurairah.