Verses with the word books in the Old Testament (3 verses):

Ecclesiastes 12:12
And further, by these, my son, be admonished: of making many books there is no end; and much study is a weariness of the flesh.

Daniel 7:10
A fiery stream issued and came forth from before him: thousand thousands ministered unto him, and ten thousand times ten thousand stood before him: the judgment was set, and the books were opened.

Daniel 9:2
In the first year of his reign I Daniel understood by books the number of the years, whereof the word of the LORD came to Jeremiah the prophet, that he would accomplish seventy years in the desolations of Jerusalem.