Charles Ellicott Commentary Daniel 7:10

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

The books—that is, the unerring record of man’s thoughts, words, and deeds, which is written in the unfailing memory of God. (Psalms 56:8; Psalms 69:28; Isaiah 4:3; Malachi 3:16.)