Mishkat al-Masabih #1866
Fasting
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَنْ أَبِي هُرَيْرَةَ رَضِيَ اللَّهُ عَنْهُ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسلم: «إِذا دخل شهر رَمَضَانُ فُتِحَتْ أَبْوَابُ السَّمَاءِ» . وَفِي رِوَايَةٍ: «فُتِّحَتْ أَبْوَابُ الْجَنَّةِ وَغُلِّقَتْ أَبْوَابُ جَهَنَّمَ وَسُلْسِلَتِ الشَّيَاطِينُ» . وَفِي رِوَايَةٍ: «فُتِحَتْ أَبْوَابُ الرَّحْمَةِ»
Abu Huraira reported God’s messenger as saying, "When Ramadan begins the gates of heaven are opened." A version has, "The gates of paradise are opened, the gates of jahannam are locked, and the devils are chained." Another has, "The gates of mercy are opened."
(Bukhari and Muslim).
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About Mishkat al-Masabih
This hadith is #1866 from Mishkat al-Masabih, in the Book of Fasting.