Leviticus 23 is structured as a calendar identifying
The occasions for festivals
The times assigned for them
The liturgies to be followed.
God, as the Lord of the Covenant, establishes the time of meeting through the holy days and festivals of the year.
The people had to respond by sanctifying themselves in order to complete the process. So sanctifying the time is a combination of divine instruction and human response.
Time is Holy. Time, with all its liturgical demarcations, belongs to God, and Time starts with the Sabbath.
The Sabbath is the sign of the covenant; it is the primordial day before the fall. It is a sign of complete dependence on God for it is "the Sabbath to the Lord. Indeed, Jesus fulfilled the promises of the Sabbath when he told us “Come unto me all ye who are weary and heavy-laden and I will give you rest” (Matt 11:28). The Long-expected eschatological rest that was promised in the new covenant.
This lecture explores in detail what it means to "enter into the rest of the Lord," so we may be able to live life and live it to the full.