Sahih al-Bukhari 3277
صحيح البخاري#3277SahihNarrated Abu Huraira:Allah's Messenger (ﷺ) said, "When the month of Ramadan comes, the gates of Paradise are opened and the gates of the (Hell) Fire are closed, and the devils are chained
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: 59:86