Genesis 2:1-3 (NKJV) 1- Thus the heavens and the earth, and all the host of them, were finished. 

2- And on the seventh day God ended His work which He had done, and He rested on the seventh day from all His work which He had done. 

3- Then God blessed the seventh day and sanctified it, because in it He rested from all His work which God had created and made.

Hebrews 4:7-9 (NKJV) 

7- again He designates a certain day, saying in David, “Today,” after such a long time, as it has been said: “Today, if you will hear His voice, Do not harden your hearts.”

8- For if Joshua had given them rest, then He would not afterward have spoken of another day. 

9- There remains therefore a rest for the people of God.