Jesus tells us in John 17:17 "sanctify them in the truth; Your Word is truth." But there are so many different versions of the Bible out there, with so many times of it being translated, how can we know the Bible is true?
Ultimately it comes down to faith, that we believe in God and believe that He has given us His perfect Word and preserved it throughout the generations, and that it is His Word for us.
2 Timothy 3:16-17 -- 16 All Scripture is breathed out by God and profitable for teaching, for reproof, for correction, and for training in righteousness, 17 that the man of God may be complete, equipped for every good work.
Hebrews 4:12 → 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.
God has preserved His Word though, and given us evidences throughout His Word that help reassure us that we can trust what it says.
THE FULFILLMENT OF PROPHECY
There are over 57 direct prophecies about Jesus specifically from the Old Testament that He fulfilled in His life on the earth. There are countless references to Jesus coming and time on the earth throughout the Old Testament as well, all of which were written 400+ years before Jesus came to the earth.
*** The Birth of Jesus Prophesied***
***The Crucifixion of Jesus Prophesied***
Click here for a complete list of the prophecies of Jesus that were fulfilled.
THE EFFECT JESUS HAS HAD ON THE WORLD
Think about it this way, Jesus was a carpenter from a town of less than 1,000 people, and He never went more than 200 miles from His home, yet people all over the world know about Him.
We know about Bethlehem, a town of less than 1,000 people in another country. We know about a carpenter from another country. We know have holidays that celebrate His birth and death and resurrection. Not only do we celebrate aspects of His life throughout the year, but His life has effected how count time. 2000+ years ago, there was something that happened that changed our counting of time from BC (commonly Before Christ) to AD (anno domini, in the year of our Lord). Even attempts to remove Jesus from time and go BCE (Before Common Era) and CE (Common Era) still fail to explain what happened 2,000 years ago that would make the shift from BCE to CE.
THE ACCURACY OF THE TEXT THROUGHOUT THE CENTURIES
In recent history, there have been discoveries that prove the accuracy of the Scriptures from the original writings. God promised this in His Word even, John 10:35, "Scripture cannot be broken", Matthew 5:18, "For truly I say to you, until heaven and earth pass away, not an iota, not a dot, will pass from the Law until all is accomplished."
In 1947, a set of scrolls was found called The Dead Sea Scrolls. They were hidden in caves by some Jews, and contain manuscripts of every Old Testament book except Esther, and they were 1,000 years older than any existing Old Testament manuscript. So here we have discovered a source of the Bible that was 1,000 years older than any current source we had currently seen, and it proved the accuracy of the current translations that we had. Throughout the centuries of copying the Bible, the text had stayed the same. The only "differences" were minor spelling variations or the transposing of certain words in a few places.
THE OVERARCHING THEME OF THE BIBLE
The Bible was written by 35 different authors, spanning thousands of years, but yet their consistency and accuracy throughout that time stayed true. There is a harmony of the Bible, with everything pointing to Jesus. Jesus said this about the Old Testament even, John 5:46, "46 For if you believed Moses, you would believe me; for he wrote of me." Everything in the Bible points to Jesus in some way or another, and the Bible never contradicts itself. It gives different views of what happened, but the overarching theme remains the same.
There are many other proofs of the accuracy of the Bible, that God has preserved through time. Some other resources that you can look into are GotQuestions and CARM.