And God rested and made the Sabbath holy

 So God blessed the seventh day and hallowed it because on it God rested from all his work which he had done in creation.

Genesis 2:3 RSV

https://bible.com/bible/2020/gen.2.3.RSV

“Say to the people of Israel, ‘You shall keep my sabbaths, for this is a sign between me and you throughout your generations, that you may know that I, the Lord, sanctify you.

Exodus 31:13 RSV

https://bible.com/bible/2020/exo.31.13.RSV

And God sanctified the Sabbath day to make it holy.

God hath called His creation good and very good, but man was not yet holy, that priceless work of being sanctified in Christ starts here.

Those first six days from when God fashioned the heavens and the earth to when he created man speak of the wonderous power of the Creator.

Up until the 7th day God showed his work of creation. When God rested on the 7th day he showed another side, that of sanctifier. His omnipotence is chief of his natural attributes and His holiness is His first moral attribute. 

He alone is Creator and He alone is Sanctifier.

Blessed are you if you understand and believe this in your heart and mind

Amen.