Sahih al-Bukhari 3836
صحيح البخاري#3836SahihNarrated Ibn `Umar:The Prophet (ﷺ) said, "If anybody has to take an oath, he should swear only by Allah." The people of Quraish used to swear by their fathers, but the Prophet (ﷺ) said, "Do not swear by your fathers
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: 63:61