حَدَّثَنَا يَحْيَى بْنُ يَحْيَى، أَخْبَرَنَا خَالِدُ بْنُ عَبْدِ اللَّهِ، عَنِ الشَّيْبَانِيِّ، عَنْ عَبْدِ اللَّهِ بْنِ شَدَّادٍ، عَنْ مَيْمُونَةَ، قَالَتْ كَانَ رَسُولُ اللَّهِ صلى الله عليه وسلم يُبَاشِرُ نِسَاءَهُ فَوْقَ الإِزَارِ وَهُنَّ حُيَّضٌ ‏.‏

Maimuna (the wife of the Holy Prophet) reported: The Messenger of Allah (PBUH) contacted and embraced his wives over the waist-wrapper when they were menstruating. Translation Not Available

Book Ref: Sahih Muslim Book 3 Hadith 579
Web Ref:  Sahih Muslim Book 3 Hadith 294