Hadithcore
Sahih al-Bukhari, 5216
sahih

Narrated `Aisha:

Whenever Allah's Messenger (ﷺ) finished his `Asr prayer, he would enter upon his wives and stay with one of them. One day he went to Hafsa and stayed with her longer than usual.

حَدَّثَنَا فَرْوَةُ، حَدَّثَنَا عَلِيُّ بْنُ مُسْهِرٍ، عَنْ هِشَامٍ، عَنْ أَبِيهِ، عَنْ عَائِشَةَ ـ رضى الله عنها ـ كَانَ رَسُولُ اللَّهِ صلى الله عليه وسلم إِذَا انْصَرَفَ مِنَ الْعَصْرِ دَخَلَ عَلَى نِسَائِهِ، فَيَدْنُو مِنْ إِحْدَاهُنَّ، فَدَخَلَ عَلَى حَفْصَةَ، فَاحْتَبَسَ أَكْثَرَ مَا كَانَ يَحْتَبِسُ‏.‏

References2 variants
In-Book Reference
Book 67, Hadith 149
USC-MSA web (English) reference
Vol. 7, Book 62, Hadith 143 (deprecated numbering scheme)