Many young Christians are of the opinion the Old Testament, while important, is not much more than history. While a vital part of the entire Bible, many have come to more or less simply discount it away. But wait a minute. We're told in 2nd Timothy 3:16, "All scripture is given by inspiration of God, and is profitable for doctrine, for reproof, for correction, for instruction in righteousness." On the day of Pentacost, what scripture was being provided to those who were hearing the Word of God? What scripture was being put forth by the Apostles? Well, of course, it was the Old Testament, along with their first hand testimonies of the teachings of Jesus. When Peter arose to address the crowd, he taught from the Old Testament. He referenced the Prophet Joel. When Philip was caught up to minister to the Ethiopian Eunuch, the testimony came from the book of Isiah. Accordingly, the Scripture comment referenced in 2nd Timothy 3:16 is to include the Old Testament. As the Bible did not come together until much later it's quite obviouse the only Scripture the Aposotles had at their disposal was the Old Testament. Young Christians need to realize the Old Testament is much, much more than just a history book. The Old Testament is just as vital to us today as it was to the Apostles back in their day.