Israel is known as the Holy Land and was the location where events crucial to all three Abrahamic religions took place. As such, it is all but impossible to make a discovery in Israel and not have the discovery have some sort of religious importance. The Dead Sea Scrolls are no different. The Dead Sea Scrolls contain the oldest known version of Isaiah, which is nearly 1,000 years older than any other known copy of this book. In fact, the scrolls are the oldest group of Old Testament manuscripts ever found. Every book of the Old Testament is represented in the Dead Sea Scrolls except the Book of Esther.
The Dead Sea Scroll copies of the Old Testament actually expand on the modern, canonical Bible. The Dead Sea Scrolls contain prophecies by Ezekiel, Jeremiah and Daniel that are not found in the Bible as well as otherwise unknown psalms attributed to David and Joshua. The cache of scrolls also contains ancient commentaries on the Old Testament, works that expand on the Law, ancient liturgical texts and wisdom writings. In addition, the final words of such important Biblical figures as Joseph, Judah, Levi, Naphtali and Amram are recorded in the scrolls as are expanded versions of famous Bible stories. For example, the reason God told Abraham to sacrifice Isaac is written in one of the Dead Sea Scrolls. Such information has revolutionized textual criticism and scholarly understanding of the Old Testament.