Mishkat al-Masabih #54
Faith
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 قَالَ قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «إِذَا زَنَى الْعَبْدُ خَرَجَ مِنْهُ الْإِيمَانُ فَكَانَ فَوْقَ رَأْسِهِ كَالظُّلَّةِ فَإِذا خرج من ذَلِك الْعَمَل عَاد إِلَيْهِ الايمان» . رَوَاهُ التِّرْمِذِيّ وَأَبُو دَاوُد
Abu Huraira reported that God's messenger said, “When a servant of God commits fornication faith departs from him and there is something like an awning over his head; but when he quits that action faith returns to him.”
Tirmidhi and Abu Dawud transmitted it.
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About Mishkat al-Masabih
This hadith is #54 from Mishkat al-Masabih, in the Book of Faith.