that the Messenger of Allah said: “Three days for a previously-married woman and seven days for a virgin.” (Using translation from Ibn Mājah 1916)   

قَالَ رَسُولُ اللَّهِ ﷺ «لِلْبِكْرِ سَبْعٌ وَلِلثَّيِّبِ ثَلَاثٌ»  

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. (Using translation from Abū Dāʾūd 2122)  

أَنَّ رَسُولَ اللَّهِ ﷺ لَمَّا تَزَوَّجَ أُمَّ سَلَمَةَ أَقَامَ عِنْدَهَا ثَلَاثًا وَقَالَ «إِنَّهُ لَيْسَ بِكِ عَلَى أَهْلِكِ هَوَانٌ إِنْ شِئْتِ سَبَّعْتُ لَكِ وَإِنْ سَبَّعْتُ لَكِ سَبَّعْتُ لِسَائِرِ نِسَائِي»