(1) باب فَضْلِ شَهْرِ رَمَضَانَ
Narrated Abu Huraira:
Abu Huraira reported Allah's Messenger (ﷺ) as saying: When it is the month of Ramadan, the gates of mercy are opened, and the gates of Hell are locked and the devils are chained.
Reference: Sahih Muslim 1079 b
In-book reference: Book 13, Hadith 2
USC-MSA web (English) reference(deprecated numbering scheme): Book 6, Hadith 2361