Mishkat al-Masabih #585
Prayer
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَنْ عُثْمَانَ رَضِيَ اللَّهُ عَنْهُ قَالَ: قَالَ رَسُولُ اللَّهِ صلى الله عَلَيْهِ وَسلم: «مَنْ صَلَّى الْعِشَاءَ فِي جَمَاعَةٍ فَكَأَنَّمَا قَامَ نِصْفَ اللَّيْلِ وَمَنْ صَلَّى الصُّبْحَ فِي جَمَاعَةٍ فَكَأَنَّمَا صَلَّى اللَّيْل كُله» . رَوَاهُ مُسلم
‘Uthman reported God’s Messenger as saying, "If anyone prays the evening prayer in company, it is as though he had remained awake in prayer half the night; but if anyone prays the Morning Prayer in company, it is as though he had prayed the whole night.”
Muslim transmitted it.
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About Mishkat al-Masabih
This hadith is #585 from Mishkat al-Masabih, in the Book of Prayer.