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.
Exodus 20:11
"The great God in His days of creation and day of rest, measured off the
first cycle as a sample for successive weeks till the close of time. On the seventh day of the first week God rested from His work, and
then blessed the day of His rest, and set it apart for the use of man.
The weekly cycle of seven literal days, six for labor, and the seventh
for rest, which has been preserved and brought down through Bible
history, originated in the great facts of the first seven days."
E.G.W.