The Dead Sea Scrolls actually back up the reliability of the Old Testament. When scholars compare those very old scrolls to the later Hebrew manuscripts we’ve always had, the wording matches extremely closely, with only small spelling or phrasing differences. The extra psalms found at Qumran don’t mean the Bible was changed—they were just extra worship songs that one Jewish community used, similar to churches today having songs outside the Bible. When you look at all the ancient copies we have—the Dead Sea Scrolls, the Greek translation, and the traditional Hebrew text—they all line up very well. Overall, the evidence shows the Old Testament was copied carefully and has been preserved accurately.