Not the op but here are some claims made by the Bible about its origin.
2 Tim 3:16 "All Scripture is inspired of God and beneficial for teaching, for reproving, for setting things straight, for disciplining in righteousness"
2 peter 1:20-21 "20 For you know this first, that no prophecy of Scripture springs from any private interpretation. 21 For prophecy was at no time brought by man’s will, but men spoke from God as they were moved by holy spirit."
Exodus 34:27 "27 Jehovah went on to say to Moses: “You are to write down these words, because in accordance with these words, I am making a covenant with you and with Israel.”
The Bible does mention that it's been written under divine inspiration at God's request. By the hand of men, but motivated and helped by holy spirit, as the scriptures say.
If interested, have a look at some of the frequently asked questions about the Bible that the Bible answers itself. This website uses only the Bible itself to answer questions about the Bible, which is a refreshing take.
jw.org/en/bible-teachings/questions/about-the-bible
I'm sure you'll find it informative.