“Is everything in the Bible true?”
In what is often referred to as the high priestly prayer of John 17, Jesus speaks to his Father on behalf of his followers. “Sanctify them in the truth,” he requests. Then he adds these words: “Your word is truth.”
Now, the Bible is the word of God. That’s not simply a nickname Christians have given to our favorite book so we can impress unsaved people with its authority; that’s something the scripture calls itself. The phrase “word of God” is used 48 times in the Bible, and the phrase “word of the Lord” another 255. These expressions are used about the Law of Moses, the Psalms and the Prophets, taking in the entire Old Testament. They are used to describe both the teaching of Jesus and his apostles, which became the basis for our New Testament. They are used as a synonym for “scripture”, which includes both, and about which Jesus himself declared, “Scripture cannot be broken.” So then, the Bible itself claims to be truth from cover to cover.
But it should be obvious that not everything in the Bible is true in exactly the same sense.