Sahih Muslim 1461
Sahih Muslim · Book 17: The Book of Suckling · How long a virgin and a previously-married woman are entitled to have the husband stay with them after marriage
Abu Qilaba reported on the authority of Anas:
وَحَدَّثَنِي مُحَمَّدُ بْنُ رَافِعٍ ، حَدَّثَنَا عَبْدُ الرَّزَّاقِ ، أَخْبَرَنَا سُفْيَانُ ، عَنْ أَيُّوبَ ، وَخَالِدٍ، الْحَذَّاءِ عَنْ أَبِي قِلاَبَةَ ، عَنْ أَنَسٍ ، قَالَ مِنَ السُّنَّةِ أَنْ يُقِيمَ، عِنْدَ الْبِكْرِ سَبْعًا . قَالَ خَالِدٌ وَلَوْ شِئْتُ قُلْتُ رَفَعَهُ إِلَى النَّبِيِّ صلى الله عليه وسلم .
It is the Sunnah to stay with a virgin (after having married her) for a week. Khalid (one of the narrators) said: If wish I can say that it can be traced up to the Prophet (ﷺ).