Surah An-Nisa 4:135

۞ 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

O you who have believed, be persistently standing firm in justice, witnesses for Allāh, even if it be against yourselves or parents and relatives. Whether one is rich or poor, Allāh 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 Allāh is ever, of what you do, Aware.

Translation: Saheeh International

Tafsir

O you who believe be upright in justice; witnesses of the truth for God even though it the witnessing be against yourselves so be witness against them your selves by affirming the truth and not concealing it; or against parents and kinsmen whether the person witnessed against be rich or poor; …

Excerpt from Tafsir al-Jalalayn, commentary on 4:135, via Quran.com. The reader has the full commentary and 9 more tafsirs.