In her first book, "Life on the Fringes," Haviva Ner-David described her quest to become an Orthodox rabbi, to serve God the same way men traditionally did. Now, Rabbi Ner-David tunes in to an aspect of God she hadn't heard before, the voice of Chanah.

Chanah, the Biblical mother of Samuel, was considered by tradition to have invented prayer. Her name is also an acronym for the three commandments given to women: Challah, the taking of an offering from baking dough; Niddah, separation during menstruation followed by immersion; and Hadlakat HaNer, lighting the Sabbath candles.

In...