وَلَن تَستَطيعوا أَن تَعدِلوا بَينَ النِّساءِ وَلَو حَرَصتُم ۖ فَلا تَميلوا كُلَّ المَيلِ فَتَذَروها كَالمُعَلَّقَةِ ۚ وَإِن تُصلِحوا وَتَتَّقوا فَإِنَّ اللَّهَ كانَ غَفورًا رَحيمًا

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. And if you amend [your affairs] and fear Allah - then indeed, Allah is ever Forgiving and Merciful.