God says
O you who believe! Be ever steadfast in upholding justice, bearing witness to the truth for the sake of God, even though it be against your own selves or your parents and kinfolk. Whether the person concern be rich or poor, God’s claim takes precedence over (the claim of) any of them.* Do not then follow your own desires lest you swerve from justice: for it you distort (the truth), Behold, God is indeed aware of all that you do! -- Q.4:135
*I.e., “do not allow the fact that a man is rich to prejudice you in his favour or against him, and do not, out of misplaced compassion, favour the poor man at the expense of truth.
Be ever steadfast in upholding justice when you witness or judge between two parties in any given situation or whether in a court of law.
Prophet said
“No judge shall pass a decree between two men while he is angry” -- H: Bukhari and Muslim. N: Abu Bakrah.
“God is with a judge so long as he is just” -- H: Tirmiz, Ibn Majah. Narrator: Abdullah.b.Abi Aufa.
“In order to pass judgment when a judge strives hard and decides justly there are two rewards for him; but in case he commits mistake though he strive for right decision, there is one reward” -- H: Bukhari and Muslim. N: Abdullah-b-Amr and Abu Hurairah.
