Mishkat al-Masabih #276
Purification
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
عَنْ جَابِرٍ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «مِفْتَاحُ الْجَنَّةِ الصَّلَاةُ وَمِفْتَاحُ الصَّلَاة الطّهُور» . رَوَاهُ أَحْمد
Jabir reported God’s messenger as saying, “The key of paradise is prayer, and the key of prayer is being purified."
Ahmad transmitted it.
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About Mishkat al-Masabih
This hadith is #276 from Mishkat al-Masabih, in the Book of Purification.