God inspired or God breathed the biblical books. He did not author them word for word.
The Bible is not the Quran which Moslems believe was written word for word by their Allah.
God breathed so told through mortal mens writings.
Galatians 3:8 is not scripture preaching to Abraham, ratherScripture foresaw that God would justify the Gentiles by faith, and announced the gospel in advance to Abraham,
God inspired the words written by men.
What Jesus left us was His community of believers.
If one quotes just Tim then one must conclude that what was written after should not be included.
John 5:39 Search the scriptures; for in them ye think ye have eternal life: and they are they which testify of me.I will argue that that author of the passages in the Old Testament that testify of Christ, knew Christ or at least knew about him. There are many examples like the life of Joseph or the second Psalm or Isaiah 53 that are obvious, but as you see Christ more and more in scripture you ask, is Christ the main character even of the Old Testament?