Mishkat al-Masabih #1173
Prayer
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: جَاءَ رجل إِلَى النَّبِي صلى فَقَالَ: إِن فلَانا يُصَلِّي بِاللَّيْلِ فَإِذَا أَصْبَحَ سَرَقَ فَقَالَ: إِنَّهُ سَيَنْهَاهُ مَا تَقُولُ. رَوَاهُ أَحْمَدُ وَالْبَيْهَقِيُّ فِي شُعَبِ الْإِيمَانِ
He told of a man who came to the Prophet and said, “So and so prays at night, and when morning comes he steals.” He replied, “What you say will restrain him.”
Ahmad and Baihaqi, in Shu'ab al-iman, transmitted it.
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About Mishkat al-Masabih
This hadith is #1173 from Mishkat al-Masabih, in the Book of Prayer.