Mishkat al-Masabih 3 Purification كتاب الطهارة 251

عَن زيد بن أسلم قَالَ: أَنَّ رَجُلًا سَأَلَ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فَقَالَ: مَا يَحِلُّ لِي مِنَ امْرَأَتِي وَهِيَ حَائِضٌ؟ فَقَالَ لَهُ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «تَشُدُّ عَلَيْهَا إِزَارَهَا ثُمَّ شَأْنُكَ بِأَعْلَاهَا» . رَوَاهُ مَالِكٌ وَالدَّارِمِيُّ مُرْسلا

Zaid b. Aslam said that a man asked God’s messenger what was lawful for him in his wife when she was menstruating, and he replied, “She should tie her waist-wrapper on her, then you can do what you like above it.” Malik and Darimi transmitted it in mursal form.