Sunnah.com reference : Book 8, Hadith 107English translation : Book 8, Hadith 1069Arabic reference : Book 8, Hadith 1058
Narrated Umm Salamah (RA):
When the Prophet (ﷺ) married her he stayed with her for three nights and said, "You are not being humbles in my estimation. If you wish I shall stay with you seven nights, and if I stay with you for seven nights I shall do the same with my other wives."

[Reported by Muslim].
وَعَنْ أُمِّ سَلَمَةَ ‏-رَضِيَ اَللَّهُ عَنْهَا‏- { أَنَّ اَلنَّبِيَّ ‏- صلى الله عليه وسلم ‏-لَمَّا تَزَوَّجَهَا أَقَامَ عِنْدَهَا ثَلَاثًا , وَقَالَ : " إِنَّهُ لَيْسَ بِكِ عَلَى أَهْلِكِ هَوَانٌ , إِنْ شِئْتِ سَبَّعْتُ لَكِ , وَإِنْ سَبَّعْتُ لَكِ سَبَّعْتُ لِنِسَائِي }  رَوَاهُ مُسْلِم ٌ  1‏ .‏‏1 ‏- صحيح .‏ رواه مسلم (1460)‏ (41)‏.‏