a sign

Exodus 31:13
"Tell the Israelites, 'Surely you must observe My Sabbaths, for this will be a sign between Me and you for the generations to come, so that you may know that I am the LORD who sanctifies you.

Ezekiel 20:12, 20
I also gave them My Sabbaths as a sign between us, so that they would know that I am the LORD who sanctifies them. . . .

six days.

Genesis 1:31
And God looked upon all that He had made, and indeed, it was very good. And there was evening, and there was morning--the sixth day.

Genesis 2:2, 3
And by the seventh day God had finished the work He had been doing; so on that day He rested from all His work. . . .

Hebrews 4:3, 4, 10
Now we who have believed enter that rest. As for the others, it is just as God has said: "So I swore on oath in my anger, 'They shall never enter My rest.'" And yet His works have been finished since the foundation of the world. . . .

and was refreshed.

Genesis 1:31
And God looked upon all that He had made, and indeed, it was very good. And there was evening, and there was morning--the sixth day.

Job 38:7
while the morning stars sang together and all the sons of God shouted for joy?

Psalm 104:31
May the glory of the LORD endure forever; may the LORD rejoice in His works.

Jeremiah 32:41
Yes, I will rejoice in doing them good, and I will faithfully plant them in this land with all My heart and soul.