Sahih Muslim Book 3, Hadith Number 580.

Chapter : Lying with one in menstruation above the waist wrapper.

Kuraibthe freed slave of Ibn Abbas, reported: I heard it from Maimuna, the wife of the Apostle of Allah (way peace be upon him): The Messenger of Allah (may peace be upon him) used to lie with me when I menstruated, and there was a cloth between me and him.