Muwatta Malik #128
Purity
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَحَدَّثَنِي عَنْ مَالِكٍ، أَنَّهُ بَلَغَهُ أَنَّ سَالِمَ بْنَ عَبْدِ اللَّهِ، وَسُلَيْمَانَ بْنَ يَسَارٍ، سُئِلاَ عَنِ الْحَائِضِ، هَلْ يُصِيبُهَا زَوْجُهَا إِذَا رَأَتِ الطُّهْرَ قَبْلَ أَنْ تَغْتَسِلَ فَقَالاَ لاَ حَتَّى تَغْتَسِلَ .
Yahya related to me from Malik that he had heard that Salim ibn
Abdullah and Sulayman ibn Yasar were asked whether the husband of a
menstruating woman could have sexual intercourse with her when she saw
that she was pure but before she had had a ghusl. They said, "No, not
until she has had a ghusl."
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About Muwatta Malik
This hadith is #128 from Muwatta Malik, in the Book of Purity.