66 Books of compilation which is known as The Bible. You can find Samuel as one of the writer under his own Name: First Samuel and Second Samuel. (the 9th and 10th books from the old testament)
In Second Peter Chapter 1, verse 19 and 20 (2Peter 1:19,20), the true God Jehovah use people here in earth to write his words yet in 2Timothy 3:16 say's: All Scripture is Inspired of God.
Please advise the evidence from the Bible which we can proof, Samuel was an angel.