SEVEN DAYS. NO EIGHTH

Day by day, God created the universe. For six days.

"And God called the light Day, and the darkness he called Night. And the evening and the morning were the first day.

And God said, Let there be a firmament in the midst of the waters, and let it divide the waters from the waters. And God made the firmament, and divided the waters which were under the firmament from the waters which were above the firmament: and it was so. And God called the firmament Heaven. And the evening and the morning were the second day.....

And God saw every thing that he had made, and, behold, it was very good. And the evening and the morning were the sixth day."
- Genesis 1:5 - 31

By the sixth day, all work was done and God rested on the seventh day:

"Thus the heavens and the earth were finished, and all the host of them. And on the seventh day God ended his work which he had made; and he rested on the seventh day from all his work which he had made.

And God blessed the seventh day, and sanctified it: because that in it he had rested from all his work which God created and made."
- Genesis 2:1 - 3

Seven days. No more, no less. No mention of an Eighth Day anywhere else after these first two chapters in the rest of the Bible.

More amazingly, it is written that on the seventh day God "rested from all his work", especially considering the accounts to follow would to narrate the whole chain of disastrous events leading from the Fall of Mankind, the sacrifice of Jesus, till the End of Time.

An utterly strange choice of activity (or rather, inactivity) from a Being who is supposed to know all things before they even unfold.

Only seven days for creation. No eighth.