Muwatta Imam Malik Book of Purity, Hadith 95

Yahya related to me from Malik from Zayd ibn Aslam that a man questioned the Messenger of Allah ﷺ saying, "What is permitted me from my wife when she is menstruating?" The Messenger of Allah ﷺ said, "Let her wrap her waist-wrapper round herself tightly, and then what is above that is your concern."

حَدَّثَنِي يَحْيَى، عَنْ مَالِكٍ، عَنْ زَيْدِ بْنِ أَسْلَمَ، أَنَّ رَجُلاً، سَأَلَ رَسُولَ اللَّهِ ﷺ فَقَالَ مَا يَحِلُّ لِي مِنِ امْرَأَتِي وَهِيَ حَائِضٌ فَقَالَ رَسُولُ اللَّهِ ﷺ " لِتَشُدَّ عَلَيْهَا إِزَارَهَا ثُمَّ شَأْنَكَ بِأَعْلاَهَا " .