Sahih al-Bukhari 303
صحيح البخاري#303SahihNarrated Maimuna:When ever Allah's Messenger (ﷺ) wanted to fondle any of his wives during the periods (menses), he used to ask her to wear an Izar
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Every narration in Sahih al-Bukhari is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 6:8