'Books' in the Bible

“A river of fire was flowingAnd coming out from before Him;A thousand thousands were attending Him,And ten thousand times ten thousand were standing before Him;The court was seated,And the books were opened.

in the first year of his reign, I, Daniel, understood from the books the number of years which, according to the word of the Lord to Jeremiah the prophet, must pass before the desolations [which had been] pronounced on Jerusalem would end; and it was seventy years.