Ayoub al-Sakhtiyani أيوب السختياني · Marriage (Kitab Al-Nikah)

When a man who has a wife married a virgin he should stay with her seven nights ; if he marries to a woman who has been previously married he should stay with her three nights. (The narrator said:) If I say that he (Anas) narrated this tradition from the Prophet (ﷺ) I shall be true. But he said: The Sunnah is so-and-so.

The Prophet (ﷺ) said: When a man has two wives and he is inclined to one of them, he will come on the Day of resurrection with a side hanging down.