Leviticus 23:3-8

“Six days shall work be done, but on the seventh day is a Sabbath of solemn rest, a holy convocation. You shall do no work. It is a Sabbath to the LORD in all your dwelling places. “These are the appointed feasts of the LORD, the holy convocations, which you shall proclaim at the time appointed for them. In the first month, on the fourteenth day of the month at twilight, is the LORD’s Passover. And on the fifteenth day of the same month is the Feast of Unleavened Bread to the LORD; for seven days you shall eat unleavened bread. On the first day you shall have a holy convocation; you shall not do any ordinary work. But you shall present a food offering to the LORD for seven days. On the seventh day is a holy convocation; you shall not do any ordinary work.”