The term 'Days of Rest' refers to the Sabbaths, which are days of rest and worship observed by many religions. The Sabbaths are typically observed on the seventh day of the week, and are a time for people to take a break from their daily activities and focus on spiritual matters. In Judaism, the Sabbath is known as Shabbat, and is observed from sundown on Friday until sundown on Saturday. In Christianity, the Sabbath is observed on Sunday, and is a day of worship and rest. In Islam, the Sabbath is known as Jumu'ah, and is observed on Fridays.