When the Messenger of Allah (ﷺ) married Safiyyah, he stayed with her three nights. The narrator 'Uthman added: She was non virgin (previously married). He said: This tradition has been narrated to me by Hushaim, reported by Humaid, and transmitted by Anas.
Sunan Abi Dawud Book 12, Hadith 78
← Previous Hadith When the Messenger of Allah (ﷺ) married Umm Salamah, he stayed with her three night, and said: Your people (i.e. clan) are not being humbled for you in my estimation. If you wish I shall stay with you seven nights; and if I stay with you seven nights, I shall stay with my other wives seven nights.

Sunan Abi Dawud Book 12, Hadith 77 Next Hadith → 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.

Sunan Abi Dawud Book 12, Hadith 79