Shulchan Arukh, Orach Chayim 417/שולחן ערוך·אורח חיים תי״ז

1Contains 1 paragraph: On the beginning of the month, it is permitted to do work. However, those women who follow a custom to not engage in work [are following] a good custom. Rema: And if the custom is to do some kinds of work and not to do some [other] kinds of work, we follow the custom.