"The Messenger of Allah said: 'When Ramadan comes, the gates of mercy are opened, the gates of Hell are closed, and the devils are chained up."' (Using translation from Nasāʾī 2100)
قَالَ رَسُولُ اللهِ ﷺ إِذَا كَانَ رَمَضَانُ فُتِّحَتْ أَبْوَابُ الرَّحْمَةِ وَغُلِّقَتْ أَبْوَابُ جَهَنَّمَ وَسُلْسِلَتِ الشَّيَاطِينُ