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." (JA)
English reference (JA): Vol. 1, Book 1, Hadith 281 (JA)
Arabic reference (JA): Book 1, Hadith 282 (JA)