Prayer—as a "service of the heart"—is in principle a Torah-based commandment. It is not time-dependent and is mandatory for both Jewish men and women. However, the rabbinic requirement to recite a specific prayer text does differentiate between men and women: Jewish men are obligated to recite three prayers each day within specific time ranges (zmanim), while, according to many approaches, women are only required to pray once or twice a day, and many not be required to recite a specific text.