There is this essential unity of purpose about the Scriptures, and Jesus speaks about it here. From Genesis to Revelation, from the Old to the New Testament, from the Hebrew to the Christian Scriptures, all of it points to Him, to Jesus. He said, you search the scriptures because you think that in them you have eternal life; and it is they that testify on my behalf (John 5:39). It’s not the Bible that save us; Jesus does. It’s not the Bible that gives life; Jesus does. It’s not Jesus who testifies on behalf of the Bible; it’s the Bible that testifies on His behalf. And indeed, there may be some who, as in Jesus’ day, have the priorities flipped. The Bible has become for them the saving book of rules, the guide to living and to eternal life. And, in a sense it is, but only in a secondary sense, for its purpose is to lead us to a place of abject dependency on God, and in particular, God as He’s revealed in Jesus Christ. As John will put it later, speaking of what he put in his gospel, these are written so that you may come to believe that Jesus is the Messiah, the Son of God, and that through believing you may have life in His Name (John 20:31). The same could be said of the Scriptures as a whole: they testify on [His] behalf. Learn to see the Bible, not as an “owner’s manual”, but rather as a “love letter” from God to You, so that you might get to know His Son, and so that you might live a life pleasing to Him in every way.
And yet, in a day and age when many people are more enamored of Jesus than they are of Christianity, when believers are more interested in the New than the Old Testament, when followers of Jesus focus more on particular parts of the Bible than on the whole, it’s instructive to take in what Jesus is saying here: they testify on My behalf. Jesus was referring, of course to what we call the Old Testament or the Hebrew Scriptures. And though He was indeed dismissing the “bibliolatry” of His day, He would equally dismiss the biblical ignorance of our day. He’s reminding us here that, if we’re ever going to hope to know or understand Him Who is the Way, the Truth, and the Life, the only One through Whom we can get to know God (John 14:6), we must get to know the Scriptures, as a whole, in their entirety. For it was Jesus who once said, do not think that I have come to abolish the law or the prophets; I have come not to abolish but to fulfill. For truly I tell you, until heaven and earth pass away, not one letter, not one stroke of a letter, will pass from the law until all is accomplished (Matthew 5:17-18).
Get to know the Bible, thoroughly. Develop a pattern or thorough Bible reading and study which will expose you to the breadth and depth of God’s Word, so that you can get to know Him more thoroughly than you ever thought possible, and so that His heart, His mind, and His will may literally life and act through you.