al-Laith bin Sa'd الليث بن سعد · The Book of Menstruation and Istihadah

"When the time of menstruation comes, stop praying, and when it goes, perform Ghusl."

"I saw her wash tub filled with blood." The Messenger of Allah (ﷺ) said to her: "Stop (praying) for as long as your period used to last, then perform Ghusl."

"That is a vein, so when your period comes, do not pray, and when your period is over, purify yourself and pray in between one period and the next." Abu 'Abdur-Rahman said: Hisham bin 'Urwah reported this Hadith from 'Urwah, and he did not mention what Al-Mundhir mentioned in it.

"The Messenger of Allah (ﷺ) would fondle one of his wives when she was menstruating, if she wore and Izar (waist wrap) that reached halfway down her thighs or to her knees.