Leviticus 23:1-3

1The Lord spoke again to Moses, saying, 2“Speak to the sons of Israel and say to them, ‘1The Lord’s appointed times which you shall 2proclaim as holy convocations--My appointed times are these:

3‘3For six days work may be done, but on the seventh day there is a Sabbath of complete rest, a holy convocation. You shall not do any work; it is a Sabbath to the Lord in all your dwellings.