Allah commands justice in judgment, speech and testimony, even against oneself and one's relatives, and even toward those one dislikes. Here are 8 passages from the Quran in Arabic with their English meaning, audio, and an easy way to copy or share them.
(90)Indeed, Allah orders justice and good conduct and giving to relatives and forbids immorality and bad conduct and oppression. He admonishes you that perhaps you will be reminded.
(58)Indeed, Allah commands you to render trusts to whom they are due and when you judge between people to judge with justice. Excellent is that which Allah instructs you. Indeed, Allah is ever Hearing and Seeing.
(8)O you who have believed, be persistently standing firm for Allah, witnesses in justice, and do not let the hatred of a people prevent you from being just. Be just; that is nearer to righteousness. And fear Allah; indeed, Allah is Acquainted with what you do.
(135)O you who have believed, be persistently standing firm in justice, witnesses for Allah, even if it be against yourselves or parents and relatives. Whether one is rich or poor, Allah is more worthy of both. So follow not [personal] inclination, lest you not be just. And if you distort [your testimony] or refuse [to give it], then indeed Allah is ever, with what you do, Acquainted.
(152)And do not approach the orphan's property except in a way that is best until he reaches maturity. And give full measure and weight in justice. We do not charge any soul except [with that within] its capacity. And when you testify, be just, even if [it concerns] a near relative. And the covenant of Allah fulfill. This has He instructed you that you may remember.
(9)And if two factions among the believers should fight, then make settlement between the two. But if one of them oppresses the other, then fight against the one that oppresses until it returns to the ordinance of Allah. And if it returns, then make settlement between them in justice and act justly. Indeed, Allah loves those who act justly.
(25)We have already sent Our messengers with clear evidences and sent down with them the Scripture and the balance that the people may maintain [their affairs] in justice. And We sent down iron, wherein is great military might and benefits for the people, and so that Allah may make evident those who support Him and His messengers unseen. Indeed, Allah is Powerful and Exalted in Might.
(15)So to that [religion of Allah] invite, [O Muhammad], and remain on a right course as you are commanded and do not follow their inclinations but say, "I have believed in what Allah has revealed of the Qur'an, and I have been commanded to do justice among you. Allah is our Lord and your Lord. For us are our deeds, and for you your deeds. There is no [need for] argument between us and you. Allah will bring us together, and to Him is the [final] destination."
Arabic text in the Uthmani script (Hafs from Asim). English meaning: Sahih International, via Tanzil.net. A translation conveys the meaning; the Quran itself is the Arabic text. · العربية