The Table Spread - 5:48
We have sent down to you this Book, which confirms the previous Books and replaces them, as a comprehensive truth, so judge between them by what Allah has sent down to you. Do not leave the truth that has come to you and follow their whim. We have appointed for each of you a law and a method, and if Allah had willed, He would have made you all one people. But He tests you with what He has given you. Compete in good deeds. To Allah is the return of all of you. He will inform you of the matters on which you differ.
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.