It was narrated that 'Aishah said:
"The Messenger of Allah (ﷺ) used to put his mouth on the place where I had drunk from, and he would drink from what was leftover by me, while I was menstruating." (IT)
English reference (IT): Vol. 1, Book 1, Hadith 281 (IT)
Arabic reference (IT): Book 1, Hadith 282 (IT)