“The times for conjugal duty prescribed in the Torah are: for men of independence, every day; for laborers, twice a week; for ass-drivers, once a week; for camel-drivers, once in thirty days; for sailors, once in six months. These are the rulings of Rabbi Eliezer. ”

“If, in order to rescue a person from drowning, one’s head becomes immersed during a period of fasting, one’s fast is invalidated, even if there was no other way of saving the drowning person’s life. (Islam)”