Sahih al-Bukhari 6356
صحيح البخاري#6356SahihNarrated `Abdullah bin Tha`laba bin Su'air:whose eye Allah's Messenger (ﷺ) had touched, that he had seen Sa`d bin Abi Waqqas offering one rak`a only for the witr prayer
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: 80:53