Leviticus 23:1-2
Feasts of the LORD
23 And the LORD spoke to Moses, saying, 2 “Speak to the children of Israel, and say to them: ‘The feasts of the LORD, which you shall proclaim to be holy convocations, these are My feasts.
The Sabbath
3 ‘Six days shall work be done, but the seventh day is a Sabbath of solemn rest, a holy convocation. You shall do no work on it; it is the Sabbath of the LORD in all your dwellings.
The New King James Version (Nashville: Thomas Nelson, 1982), Le 23:1-3.