Abu Huraira reported: The Messenger of Allah, peace and blessings be upon him, said:
إِذَا دَخَلَ شَهْرُ رَمَضَانَ فُتِّحَتْ أَبْوَابُ السَّمَاءِ وَغُلِّقَتْ أَبْوَابُ جَهَنَّمَ وَسُلْسِلَتِ الشَّيَاطِين
When the month of Ramadan begins, the gates of the heaven are opened, the gates of Hellfire are closed, and the devils are chained.
Source: Ṣaḥīḥ al-Bukhārī 1899
