A freed slave-woman of Sayyidah Maymunah bint al-Harith (may Allah be pleased with her) said: Maymunah (may Allah be pleased with her) sent me to Ibn Abbas (may Allah be pleased with them both), and I saw that his bed was set apart from his wife's bed. The daughter of Mishrah was with him that day, so I asked: What is the matter with you? She said: This is what he does with me when I menstruate. She said: So I came to Maymunah (may Allah be pleased with her) and told her, and she sent me to him (to say): What is this that you are doing? The Messenger of Allah (peace and blessings be upon him) used to touch one of us while she was menstruating, with nothing on her but her waist-wrapper reaching the middle of her thigh.
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 20388