Leviticus 16:29

29“This shall be a permanent statute for you: in the seventh month (nearly October) on the tenth day of the month you shall 16:29 It is assumed by many that humbling oneself is a reference to fasting, but if so, there is no reason to limit the idea to that. The rabbis taught that it was forbidden to eat, drink, wash, anoint oneself (with oil for the hair), put on footwear, or have marital relations. Fasting was defined as eating less than the volume of a large date and drinking less than a mouthful of liquid.humble yourselves [by fasting] and not do any work, whether the native-born or the stranger who lives temporarily among you;