Leviticus 23:1-3
Rules for the Seasons and for the special days
1 The Lord said to Moses, 2 ‘Tell Israel's people about the special days when they must worship the Lord. They are holy days. The Israelites must come together and have a feast on these days.
3 There are six days when a person can work. The seventh day is the Sabbath day. A person must not do any work on that day. It is a day when people meet together for worship. You must not work in any place where you live. It is the Sabbath to the Lord, a day of rest.