Sahih al-Bukhari 1167
صحيح البخاري#1167SahihNarrated Abu Qatada bin Rabi Al-Ansari:The Prophet (ﷺ) said, "If anyone of you enters a Mosque, he should not sit until he has offered a two-rak`at 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: 19:46