´It was narrated from Abu Hurairah:` that the Messenger of Allah said: "Whoever has two wives and favors one of them over the other, he will come on the Day of Resurrection with one of his sides leaning."
Hadith ReferenceSunan Ibn Majah / The Chapters on Marriage / Hadith: 1969
Hadith Gradingالألبانی:صحيح | زبیر علی زئی:ضعيف, إسناده ضعيف سنن أبي داود (2133) ترمذي (1141) نسائي (3394), انوار الصحيفه، صفحه نمبر 449