oThe New Testament writers confirmed the Old Testament was God speaking. Hebrews 4:12 “For the word of God is living and active, sharper than any two-edged sword, piercing to the division of soul and of spirit, of joints and of marrow, and discerning the thoughts and intentions of the heart.”
oThroughout the Bible, God warns not to add, to take away from His Word. Rev. 22:18-19 “I warn everyone who hears the words of the prophecy of this book: if anyone adds to them, God will add to him the plagues described in this book,  and if anyone takes away from the words of the book of this prophecy, God will take away his share in the tree of life and in the holy city, which are described in this book.”
oJesus in His sayings confirmed the Old Testament as being without error. Luke 24:44 "These are my words that I spoke to you while I was still with you, that everything written about me in the Law of Moses and the Prophets and the Psalms must be fulfilled."
oThose involved in science say the Bible is not accurate, but every time science tries to disprove the Bible, it ends up proving it. The Bible has never changed over the thousands of years since it was written. The Bible is authoritative and can be trusted as such. No piece of literature even approaching its age comes close to having the supportive textual evidence indicating authenticity that the Bible has. It is simply the most reliable text in existence.
We should read and study the Bible because there is so much false teaching. The Bible gives us the measuring stick by which we can distinguish truth from error. Amos 7:8 “And the Lord said to me, "Amos, what do you see?"...