Surah An-Nisaa, Verse 129
Translation — Sahih International
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.
Source
Kur'an-ı Kerim, Nisâ Suresi 4:129
https://kuran.diyanet.gov.tr/mushaf/kuran-meal-2/4-suresi-129-ayet