It was narrated from Al-Harith from his father that when when the Messenger of Allah ﷺ married Umm Salamah, he stayed with her for three days, then he said:
“You are not insignificant in your husband's eyes. If you wish, I will stay with you for seven days, but then I will stay with my other wives for seven days too.”

حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا يَحْيَى بْنُ سَعِيدٍ الْقَطَّانُ، عَنْ سُفْيَانَ، عَنْ مُحَمَّدِ بْنِ أَبِي بَكْرٍ، عَنْ عَبْدِ الْمَلِكِ، - يَعْنِي ابْنَ أَبِي بَكْرِ بْنِ الْحَارِثِ بْنِ هِشَامٍ - عَنْ أَبِيهِ، عَنْ أُمِّ سَلَمَةَ، أَنَّ رَسُولَ اللَّهِ ﷺ لَمَّا تَزَوَّجَ أُمَّ سَلَمَةَ أَقَامَ عِنْدَهَا ثَلاَثًا وَقَالَ " لَيْسَ بِكِ عَلَى أَهْلِكِ هَوَانٌ إِنْ شِئْتِ سَبَّعْتُ لَكِ وَإِنْ سَبَّعْتُ لَكِ سَبَّعْتُ لِنِسَائِي " .