The Arabic Letter Sad - 38:24 "He said, "He has wronged you by asking to add your sheep to his sheep. Indeed, most of the sharecroppers take away each other´s rights. Except those who believe and do righteous deeds, and how few are they in number!"And David asked forgiveness and bowed down and turned to Us, thinking that We had tested him."
When making a judgment:
The Women/4:135 Believers! Bear witness for the sake of Allah and observe justice, even against yourselves and your parents and your relatives. Whether rich or poor, Allah takes care of both groups. So do not be biased in accordance with your personal interests and feelings. If you distort the truth, or if you refrain from testifying, know that Allah is aware of what you do.

The Table Spread/5:8 Believers! Bear witness for Allah with justice. Let not your hatred against a people prevent you from acting justly. It is more virtuous to act justly. Listen to Allah. Allah is aware of what you do.
The Table Spread/5:42 They listen to falsehood and eat illegally. If they come to you, judge between them or turn away. If you turn away from them, they can do you no harm. If you judge, judge between them with justice. Allah loves the just.
The Table Spread/5:44 We sent down the Torah in which is guidance and light, and the Muslim prophets used to judge between the Jews by it. And the rabbis and the scribes used to judge by what they were commanded from the Book of Allah, and they were witnesses over it. Do not honor the people, honor Me, and do not sell My verses at a cheap price. Those who do not judge by what Allah has revealed are disbelievers.