Muwatta Malik #125
Purity
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
حَدَّثَنِي يَحْيَى، عَنْ مَالِكٍ، عَنْ زَيْدِ بْنِ أَسْلَمَ، أَنَّ رَجُلاً، سَأَلَ رَسُولَ اللَّهِ صلى الله عليه وسلم فَقَالَ مَا يَحِلُّ لِي مِنِ امْرَأَتِي وَهِيَ حَائِضٌ فَقَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم
" لِتَشُدَّ عَلَيْهَا إِزَارَهَا ثُمَّ شَأْنَكَ بِأَعْلاَهَا " .
Yahya related to me from Malik from Zayd ibn Aslam that a man
questioned the Messenger of Allah, may Allah bless him and grant him
peace, saying, "What is permitted me from my wife when she is
menstruating?" The Messenger of Allah, may Allah bless him and grant
him peace, said, "Let her wrap her waist-wrapper round herself
tightly, and then what is above that is your concern."
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About Muwatta Malik
This hadith is #125 from Muwatta Malik, in the Book of Purity.