Leviticus 15:19, 23
Leviticus 15:19 NIV
“ ‘When a woman has her regular flow of blood, the impurity of her monthly period will last seven days, and anyone who touches her will be unclean till evening.
Leviticus 15:23 NIV
Whether it is the bed or anything she was sitting on, when anyone touches it, they will be unclean till evening.