The Sabbath: God: Sanctified
Source: TTT
Genesis 2:3
Then God blessed the seventh day and sanctified it, because on that day He rested from all the work of creation that He had accomplished.
Exodus 31:15
For six days work may be done, but the seventh day is a Sabbath of complete rest, holy to the LORD. Whoever does any work on the Sabbath day must surely be put to death.