Leviticus 15:19, 23
Leviticus 15:19 NLT
“Whenever a woman has her menstrual period, she will be ceremonially unclean for seven days. Anyone who touches her during that time will be unclean until evening.
Leviticus 15:23 NLT
This includes her bed or any other object she has sat on; you will be unclean until evening if you touch it.