'When Ramadan begins, the gates of Paradise are opened, the gates of Hell are closed, and the devils are chained up." (Using translation from Nasāʾī 2099)
قَالَ رَسُولُ اللهِ ﷺ «إِذَا دَخَلَ رَمَضَانُ فُتِّحَتْ أَبْوَابُ الْجَنَّةِ وَغُلِّقَتْ أَبْوَابُ جَهَنَّمَ وَسُلْسِلَتِ الشَّيَاطِينُ»