(98) باب الْمَرْأَةِ تَهَبُ يَوْمَهَا مِنْ زَوْجِهَا لِضَرَّتِهَا وَكَيْفَ يُقْسِمُ ذَلِكَ
Narrated `Aisha:
Sauda bint Zam`a gave up her turn to me (`Aisha), and so the Prophet (ﷺ) used to give me (`Aisha) both my day and the day of Sauda.
Reference: Sahih al-Bukhari 5212
In-book reference: Book 67, Hadith 145
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 7, Book 62, Hadith 139