Sahih al-Bukhari 5890
صحيح البخاري#5890SahihNarrated Ibn `Umar:Allah's Messenger (ﷺ) said, "To shave the pubic hair. to clip the nails and to cut the moustaches short, are characteristics of the Fitra
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: 77:107