The OT never equated Satan with the devil; it's a "deuterocanonical" concept that was incorporated into the New Testament by the Apostles because they used the Septruagint.
The Jews didn't associate evil with Satan. The Christians do. The roots of that are in the 'deuterocanonical' books. Judaism considers Satan a loyal and obedient servaht of God. Ihe is portrayed that way in the OT.
To say that the Apostles got their information from the deuterocanonical is meaningless. Assuming the Apostles did get some of their information out of these books, that doesn't validate that EVERYTHING written in the deuterocanonical is inspired. It means only that this portion is inspired written exactly as it is written by the Apostles-not in the deuterocanonical. Had John inserted the entire book of Tobias into Revelation, Tobias would have been inspired.
However, as I have posted several times now, the Jewish fathers HAD the Old Testament, declared it inspired and used it. And what they used did not include the deuterocanonicals. Three hundred years later the Greek Church fathers decided to add some more and that started the problems.
It's just like you Greeks. Always wanting to read more. :O)
"The Jews didn't associate evil with Satan. The Christians do. The roots of that are in the 'deuterocanonical' books. Judaism considers Satan a loyal and obedient servaht of God. Ihe is portrayed that way in the OT."
Jesus is the one who identified the devil as Satan in Matt. 4 during the temptation and taught the disciples that Satan was the enemy, the accuser. He identified Satan as Lucifer of Ezekiel 28 and Isaiah 14 when He said He saw him fall from heaven Luke 10:18. He prayed that god would keep Peter from the evil one. It was not the apocrypjal books that taught the disciples; it was Jesus. In fact, there is only one obscure quote from the apocryphal books in the whole bible and that by Jude concerning someone named Enoch. All the other books are mentioned with authority, but Enoch is not cited as scripture. It is mentioned in passing as Paul did with the pagan poets and philosophers.
"Judaism considers Satan a loyal and obedient servaht of God. Ihe is portrayed that way in the OT"
That's not what 1 Chron. 21:1, Job 1:6, 12, Psalms 109:6 and Zech. 3:2 say. Satan is considered the adversary provoking David, Job and Israel and the Lord rebukes him.