'Separation' in the Bible

So David sent some messengers, took her from her home, and she went to him, and he had sex with her. (She had been consecrating herself following her menstrual separation.) Then she returned to her home.

if he doesn't eat at mountain shrines, and doesn't look to the idols that have been erected in Israel's house, if he doesn't defile his neighbor's wife or approach a woman during her time of menstrual separation,