Sahih al-Bukhari 1087
صحيح البخاري#1087SahihNarrated Ibn `Umar:The Prophet (ﷺ) said, "A woman should not travel for more than three days except with a Dhi-Mahram
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: 18:8