The Holy Quran 4:129 — Surah An-Nisa

Arabic text

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

Translation

You will never be able to maintain perfect justice (in sharing your love) between (your) wives however much you may desire to do so (because no person has complete control over the inclinations of the heart). However, do not ignore any of them totally, leaving her suspended (leaving her like one who is neither married nor single because although legally married, she will be without love like a single woman). If you make peace (by distributing your wealth and time equally between your wives) and adopt Taqwa, then surely Allaah is Most Forgiving, Most Merciful (He will forgive you for your heart's additional inclination to one wife over another.)

Tafsir (excerpt) — Tafsir Usmani

Equality between wives: that is, if you have several wives in marriage, you will not be able to keep complete equality and parity in the love of the heart and in each and every matter; but do not commit such injustice either as to incline entirely towards one and leave the other hanging in between — so that you neither keep her in comfort yourself nor…

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