Surah An-Nisa, ayah 129

وَلَن تَسۡتَطِيعُوٓاْ أَن تَعۡدِلُواْ بَيۡنَ ٱلنِّسَآءِ وَلَوۡ حَرَصۡتُمۡۖ فَلَا تَمِيلُواْ كُلَّ ٱلۡمَيۡلِ فَتَذَرُوهَا كَٱلۡمُعَلَّقَةِۚ وَإِن تُصۡلِحُواْ وَتَتَّقُواْ فَإِنَّ ٱللَّهَ كَانَ غَفُورٗا رَّحِيمٗا ١٢٩

Walan tastatī'ū an ta'dilū baynan-nisā'i walaw harastum falā tamīlū kullal-mayli fatadharūhā kal-mu'allaqati wa in tuslihū watattaqū fa innallāha kāna ghafūrar rahīmā

And you will never be able to be equal [in feeling] between wives, even if you should strive [to do so]. So do not incline completely [toward one] and leave another hanging.²²¹ And if you amend [your affairs] and fear Allāh - then indeed, Allāh is ever Forgiving and Merciful.