Sura al-Nisāʾ 4:3

وَإِنْ خِفْتُمْ أَلَّا تُقْسِطُوا۟ فِى ٱلْيَتَٰمَىٰ فَٱنكِحُوا۟ مَا طَابَ لَكُم مِّنَ ٱلنِّسَآءِ مَثْنَىٰ وَثُلَٰثَ وَرُبَٰعَ فَإِنْ خِفْتُمْ أَلَّا تَعْدِلُوا۟ فَوَٰحِدَةً أَوْ مَا مَلَكَتْ أَيْمَٰنُكُمْ ذَٰلِكَ أَدْنَىٰٓ أَلَّا تَعُولُوا۟

wa-in khiftum allā tuqsiṭū fī l-yatāmā fa-inkiḥū mā ṭāba la-kum mina l-nisāʾi mathna wa-thulātha wa-rubāʿa fa-in khiftum allā taʿdilū fa-wāḥidatan aw mā malakat aymānukum dhālika adnā allā taʿūlū

If ye fear that ye shall not be able to deal justly with the orphans, Marry women of your choice, Two or three or four; but if ye fear that ye shall not be able to deal justly (with them), then only one, or (a captive) that your right hands possess, that will be more suitable, to prevent you from doing injustice.

Sura al-Nisāʾ 4:129

وَلَن تَسْتَطِيعُوٓا۟ أَن تَعْدِلُوا۟ بَيْنَ ٱلنِّسَآءِ وَلَوْ حَرَصْتُمْ فَلَا تَمِيلُوا۟ كُلَّ ٱلْمَيْلِ فَتَذَرُوهَا كَٱلْمُعَلَّقَةِ وَإِن تُصْلِحُوا۟ وَتَتَّقُوا۟ فَإِنَّ ٱللَّـهَ كَانَ غَفُورًا رَّحِيمًا

wa-lan tastaṭīʿū an taʿdilū bayna l-nisāʾi wa-law ḥaraṣtum fa-lā tamīlū kulla l-mayli fatadharūhā ka-l-muʿallaqati wa-in tuṣliḥū wa-tattaqū fa-inna allāha kāna ghafūran raḥīman

Ye are never able to be fair and just as between women, even if it is your ardent desire: But turn not away (from a woman) altogether, so as to leave her (as it were) hanging (in the air). If ye come to a friendly understanding, and practise self-restraint, Allah is Oft-forgiving, Most Merciful.

Sura al-Nisāʾ 4:135

يَٰٓأَيُّهَا ٱلَّذِينَ ءَامَنُوا۟ كُونُوا۟ قَوَّٰمِينَ بِٱلْقِسْطِ شُهَدَآءَ لِلَّـهِ وَلَوْ عَلَىٰٓ أَنفُسِكُمْ أَوِ ٱلْوَٰلِدَيْنِ وَٱلْأَقْرَبِينَ إِن يَكُنْ غَنِيًّا أَوْ فَقِيرًا فَٱللَّـهُ أَوْلَىٰ بِهِمَا فَلَا تَتَّبِعُوا۟ ٱلْهَوَىٰٓ أَن تَعْدِلُوا۟ وَإِن تَلْوُۥٓا۟ أَوْ تُعْرِضُوا۟ فَإِنَّ ٱللَّـهَ كَانَ بِمَا تَعْمَلُونَ خَبِيرًا

yā-ayyuhā lladhīna āmanū kūnū qawwāmīna bil-qisṭi shuhadāʾa lillāhi wa-law ʿala anfusikum awi l-wālidayni wa-l-aqrabīna in yakun ghaniyyan aw faqīran fallāhu awlā bihimā fa-lā tattabiʿū l-hawā an taʿdilū wa-in talwu aw tuʿriḍū fa-inna allāha kāna bi-mā taʿmalūna khabīran

O ye who believe! stand out firmly for justice, as witnesses to Allah, even as against yourselves, or your parents, or your kin, and whether it be (against) rich or poor: for Allah can best protect both. Follow not the lusts (of your hearts), lest ye swerve, and if ye distort (justice) or decline to do justice, verily Allah is well-acquainted with all that ye do.

Sura al-Māʾidah 5:8

يَٰٓأَيُّهَا ٱلَّذِينَ ءَامَنُوا۟ كُونُوا۟ قَوَّٰمِينَ لِلَّـهِ شُهَدَآءَ بِٱلْقِسْطِ وَلَا يَجْرِمَنَّكُمْ شَنَـَٔانُ قَوْمٍ عَلَىٰٓ أَلَّا تَعْدِلُوا۟ ٱعْدِلُوا۟ هُوَ أَقْرَبُ لِلتَّقْوَىٰ وَٱتَّقُوا۟ ٱللَّـهَ إِنَّ ٱللَّـهَ خَبِيرٌۢ بِمَا تَعْمَلُونَ

yā-ayyuhā lladhīna āmanū kūnū qawwāmīna lillāhi shuhadāʾa bil-qisṭi wa-lā yajrimannakum shanaʾānu qawmin ʿala allā taʿdilū aʿdilū huwa aqrabu lil-taqwā wattaqū allāha inna allāha khabīrun bi-mā taʿmalūna

O ye who believe! stand out firmly for Allah, as witnesses to fair dealing, and let not the hatred of others to you make you swerve to wrong and depart from justice. Be just: that is next to piety: and fear Allah. For Allah is well-acquainted with all that ye do.

Sura al-Anʿām 6:152

وَلَا تَقْرَبُوا۟ مَالَ ٱلْيَتِيمِ إِلَّا بِٱلَّتِى هِىَ أَحْسَنُ حَتَّىٰ يَبْلُغَ أَشُدَّهُۥ وَأَوْفُوا۟ ٱلْكَيْلَ وَٱلْمِيزَانَ بِٱلْقِسْطِ لَا نُكَلِّفُ نَفْسًا إِلَّا وُسْعَهَا وَإِذَا قُلْتُمْ فَٱعْدِلُوا۟ وَلَوْ كَانَ ذَا قُرْبَىٰ وَبِعَهْدِ ٱللَّـهِ أَوْفُوا۟ ذَٰلِكُمْ وَصَّىٰكُم بِهِۦ لَعَلَّكُمْ تَذَكَّرُونَ

wa-lā taqrabū māla l-yatīmi illā billatī hiya aḥsanu ḥattā yablugha ashuddahu wa-awfū l-kayla wa-l-mīzāna bil-qisṭi lā nukallifu nafsan illā wusʿahā wa-idhā qultum faʿdilū wa-law kāna dhā qurba wa-biʿahdi allāhi awfū dhālikum waṣṣakum bihi la-ʿallakum tadhakkarūna

And come not nigh to the orphan's property, except to improve it, until he attain the age of full strength; give measure and weight with (full) justice;- no burden do We place on any soul, but that which it can bear;- whenever ye speak, speak justly, even if a near relative is concerned; and fulfil the covenant of Allah: thus doth He command you, that ye may remember.