Sahih Muslim 1460
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
Umm Salama (Allah be pleased with her) reported that Allah's Messenger (ﷺ) married her, and he (the narrator) made mention of so many things in this connection (and one of them was this) that he said:
حَدَّثَنِي أَبُو كُرَيْبٍ، مُحَمَّدُ بْنُ الْعَلاَءِ حَدَّثَنَا حَفْصٌ، - يَعْنِي ابْنَ غِيَاثٍ - عَنْ عَبْدِ، الْوَاحِدِ بْنِ أَيْمَنَ عَنْ أَبِي بَكْرِ بْنِ عَبْدِ الرَّحْمَنِ بْنِ الْحَارِثِ بْنِ هِشَامٍ ، عَنْ أُمِّ سَلَمَةَ ، ذَكَرَ أَنَّصلى الله عليه وسلم تَزَوَّجَهَا وَذَكَرَ أَشْيَاءَ هَذَا فِيهِ قَالَ " إِنْ شِئْتِ أَنْ أُسَبِّعَ لَكِ وَأُسَبِّعَ لِنِسَائِي وَإِنْ سَبَّعْتُ لَكِ سَبَّعْتُ لِنِسَائِي " .
If you desire that I spend a week with you, I shall have to spend a week with my (other) wives, and if spend a week with you, I shall have to spend a week with my (other) wives.