He first rested on it,
and after resting He blessed it
and made it holy.
And God blessed the seventh day, and sanctified it: because that in it he had rested from all his work which God created and made....For in six days the LORD made heaven and earth, the sea, and all that in them is, and rested the seventh day: wherefore the LORD blessed the sabbath day, and hallowed it.
Genesis 2:3/Exodus 20:11