Mukhtasar Muslim

Umm al-Mu'mineen Aisha Siddiqa (may Allah be pleased with her) says: I used to drink water, then after drinking I would give the vessel to the Messenger of Allah (peace and blessings be upon him), and he would place his mouth at the same spot where I had placed my mouth and drink the water, even though I was menstruating. And I used to gnaw on a bone, then give it to the Messenger of Allah (peace and blessings be upon him), and he would place his mouth at the same spot where I had placed mine.