Mishkat al-Masabih #421
Purification
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَنْ أَبِي سَعِيدٍ الْخُدْرِيِّ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «إِذَا أَتَى أَحَدُكُمْ أَهْلَهُ ثُمَّ أَرَادَ أَنْ يَعُودَ فَلْيَتَوَضَّأْ بَينهمَا وضُوءًا» . رَوَاهُ مُسلم
Abu Sa'id al-Khudri reported God’s messenger as saying, “When any of you has intercourse with his wife and wishes to repeat it, he must perform ablution between the two acts.”
Muslim transmitted it.
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About Mishkat al-Masabih
This hadith is #421 from Mishkat al-Masabih, in the Book of Purification.