Abu Huraira reported: The Messenger of Allah, peace and blessings be upon him, said, “On the first night of the month of Ramadan, the devils are chained and the jinn are restrained, the gates of Hellfire are closed and none of its gates are opened, the gates of Paradise are opened and none of its gates are closed, and a heavenly caller announces: O seeker of good, come near! O seeker of evil, stop short! Allah has those He saves from the Hellfire, and that is during every night.”
Source: Sunan al-Tirmidhī 682
Grade: Hasan (fair) according to Al-Albani
عَنْ أَبِي هُرَيْرَةَ قَالَ قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ إِذَا كَانَ أَوَّلُ لَيْلَةٍ مِنْ شَهْرِ رَمَضَانَ صُفِّدَتْ الشَّيَاطِينُ وَمَرَدَةُ الْجِنِّ وَغُلِّقَتْ أَبْوَابُ النَّارِ فَلَمْ يُفْتَحْ مِنْهَا بَابٌ وَفُتِّحَتْ أَبْوَابُ الْجَنَّةِ فَلَمْ يُغْلَقْ مِنْهَا بَابٌ وَيُنَادِي مُنَادٍ يَا بَاغِيَ الْخَيْرِ أَقْبِلْ وَيَا بَاغِيَ الشَّرِّ أَقْصِرْ وَلِلَّهِ عُتَقَاءُ مِنْ النَّارِ وَذَلكَ كُلُّ لَيْلَةٍ
682 سنن الترمذي كتاب الصوم باب ما جاء في فضل شهر رمضان
759 المحدث الألباني خلاصة حكم المحدث حسن في صحيح الجامع