[ALLAH’S Quran – 2:193] “And fight them on until there is no more Tumult or oppression, and there prevail justice and faith in Allah; but if they cease, Let there be no hostility except to those who practice oppression.”

The Prophet (Peace Be Upon Him) has said :
[Muslim, Book #032, Hadith #6247 ] “Abu Dharr reported Allah’s Messenger (may peace be upon him) as saying that he reported it from his Lord, the Exalted and Glorious: Verily I have made oppression unlawful for Me and for My servants too, so do not commit oppression.”

[Muslim, Book #032, Hadith #6248 ] “Jabir b. Abdullah reported that Allah’s Messenger (may peace be upon him) said: Be on your guard against committing oppression, for oppression is a darkness on the Day of Resurrection, and be on your guard against petty mindedness for petty mindedness destroyed those who were before you, as it incited them to shed blood and make lawful what was unlawful for them.”

[Muslim, Book #032, Hadith#6250] “Salim reported on the authority of his father that Allah’s Messenger (may peace be upon him) said: A Muslim is the brother of a fellow-Muslim. He should neither commit oppression upon him nor ruin him, and he who meets the need of a brother, Allah would meet big needs, and he who relieved a Muslim from hardship Allah would relieve him from the hardships to which he would be put on the Day of Resurrection, and he who did not expose (the follies of a Muslim) Allah would conceal his follies on the Day of Resurrection.”

[Sunnan Abudawud, Book #41, Hadith #4884] “Narrated Abu Bakrah: The Prophet (peace_be_upon_him) said: There is no sin more fitted to have punishment meted out by Allah to its perpetrator in advance in this world along with what He stores up for him in the next world than oppression and severing ties of relationship.”