Believers are told to stand firm for justice even against themselves, their parents or relatives, rich or poor. And the hatred of a people must never lead them to be unjust, because justice is closest to taqwa, being mindful of Allah.
An-Nisa 4:135
Listen on Quran.com۞ يَـٰٓأَيُّهَا ٱلَّذِينَ ءَامَنُوا۟ كُونُوا۟ قَوَّٰمِينَ بِٱلْقِسْطِ شُهَدَآءَ لِلَّهِ وَلَوْ عَلَىٰٓ أَنفُسِكُمْ أَوِ ٱلْوَٰلِدَيْنِ وَٱلْأَقْرَبِينَ ۚ إِن يَكُنْ غَنِيًّا أَوْ فَقِيرًا فَٱللَّهُ أَوْلَىٰ بِهِمَا ۖ فَلَا تَتَّبِعُوا۟ ٱلْهَوَىٰٓ أَن تَعْدِلُوا۟ ۚ وَإِن تَلْوُۥٓا۟ أَوْ تُعْرِضُوا۟ فَإِنَّ ٱللَّهَ كَانَ بِمَا تَعْمَلُونَ خَبِيرًا
4:135O you who believe, be upholders of justice - witnesses for Allah, even though against (the interest of) your selves or the parents, and the kinsmen. One may be rich or poor, Allah is better caretaker of both. So do not follow desires, lest you should swerve. If you twist or avoid (the evidence), then, Allah is all-aware of what you do.
Al-Ma'idah 5:8
Listen on Quran.comيَـٰٓأَيُّهَا ٱلَّذِينَ ءَامَنُوا۟ كُونُوا۟ قَوَّٰمِينَ لِلَّهِ شُهَدَآءَ بِٱلْقِسْطِ ۖ وَلَا يَجْرِمَنَّكُمْ شَنَـَٔانُ قَوْمٍ عَلَىٰٓ أَلَّا تَعْدِلُوا۟ ۚ ٱعْدِلُوا۟ هُوَ أَقْرَبُ لِلتَّقْوَىٰ ۖ وَٱتَّقُوا۟ ٱللَّهَ ۚ إِنَّ ٱللَّهَ خَبِيرٌۢ بِمَا تَعْمَلُونَ
5:8O you who believe, be steadfast for (obeying the commands of) Allah, (and) witnesses for justice. Malice against a people should not prompt you to avoid doing justice. Do justice. That is nearer to Taqwā. Fear Allah. Surely, Allah is All-Aware of what you do.
English translation: Mufti Muhammad Taqi Usmani, The Meanings of the Noble Qur'an, via Quran.com. Arabic: Uthmani script.
When is being fair hardest for you?