Sufyan bin 'Uyaynah سفيان بن عيينة · The Book of Menstruation and Istihadah

"That is not menstruation, rather it is a vein. Tell her not to pray for the period of time that her period used to last, then let her perform Ghusl and pray." She used to perform Ghusl for every prayer.

"I heard 'Aishah say: 'The Messenger of Allah (ﷺ) would give me the vessel and I would drink from it, when I was menstruating, then I would give it to him and he would look for the place where I had put my mouth and put that to his mouth.'"

"I would drink when I was menstruating, then I would hand it to the Prophet (ﷺ), and he would put his mouth where mine had been and drink. And I would nibble at a bone on which some bits of meat were left when I was menstruating, then I would give it to the Prophet (ﷺ) and he would put his mouth where my mouth had been."

(Another chain) with similarity.