Abdullah bin Wahb عبد الله بن وهب بن مسلم القرشي · The Book of Menstruation and Istihadah

"The Messenger of Allah (ﷺ) would fondle one of his wives when she was menstruating, if she wore and Izar (waist wrap) that reached halfway down her thighs or to her knees.

"I heard Umm Qais bint Mihsan say that she asked the Messenger of Allah (ﷺ) about menstrual blood that gets on one's clothes. He said: 'Scratch it with a stick and wash it with water and lotus leaves.'"