Genesis 2 v1-3 speaks of God resting from all His work of creation, and how the Sabbath day is set apart for us to rest from our weekly work and devote ourselves to knowing and worshipping God.

Genesis 2:1–3

The Seventh Day, God Rests

2:1 Thus the heavens and the earth were finished, and all the host of them. 2 And on the seventh day God finished his work that he had done, and he rested on the seventh day from all his work that he had done. 3 So God blessed the seventh day and made it holy, because on it God rested from all his work that he had done in creation.

(ESV)