Sahih Bukhari
Sahih Bukhari Volume 001, Book 006, Hadith Number 300.
Hadith Section/Book: Sahih Bukhari Sahih Bukhari Book 06. Menstrual Periods
Narated By Maimuna : When ever Allah's Apostle wanted to fondle any of his wives during the periods (menses), he used to ask her to wear an Izar.