" There has come to you Ramadan in which the gates of Paradise are opened, the gates of the fire are closed and the devils are chained up." (Sahih) Abu 'Abdur-Rahman said: this narration is a mistake.
أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ هَذَا رَمَضَانُ قَدْ جَاءَكُمْ تُفَتَّحُ فِيهِ أَبْوَابُ الْجَنَّةِ وَتُغَلَّقُ فِيهِ أَبْوَابُ النَّارِ وَتُسَلْسَلُ فِيهِ الشَّيَاطِينُ قَالَ أَبُو عَبْدِ الرَّحْمَنِ هَذَا الْحَدِيثُ خَطَأٌ