Markandeyapurana 34.43

34.43

upavītamalaṅkāraṃ karakañcaiva varjayet /
caturdaśyāntathāṣṭamyāṃ pañcadaśyāñca parvasu //

“He should avoid the sacred thread, an ornament, and the water-pot on the fourteenth, eighth and fifteenth days of the moon and at its four changes. He should also eschew rubbing his body with oil, and sexual intercourse with his wife, on those days.