Dead Sea Scrolls
Biblical significance

Before the discovery of the Dead Sea Scrolls, the oldest Hebrew-language manuscripts of the Bible were Masoretic texts dating to the 10th century CE, such as the Aleppo Codex. Today, the oldest known extant manuscripts of the Masoretic Text date from approximately the 9th century. The biblical manuscripts found among the Dead Sea Scrolls push that date back a full thousand years, to the 2nd century BCE. This was a significant discovery for Old Testament scholars who anticipated that the Dead Sea Scrolls would either affirm or repudiate the reliability of textual transmission from the original texts to the oldest Masoretic texts at hand. The discovery demonstrated the unusual accuracy of transmission over a thousand-year period, rendering it reasonable to believe that current Old Testament texts are reliable copies of the original works.

According to The Dead Sea Scrolls by Hebrew scholar Millar Burrows

Of the 166 words in Isaiah 53, there are only seventeen letters in question. Ten of these letters are simply a matter of spelling, which does not affect the sense. Four more letters are minor stylistic changes, such as conjunctions. The remaining three letters comprise the word "light," which is added in verse 11, and does not affect the meaning greatly.

It is important to note that differences were found among fragments of texts. According to The Oxford Companion to Archaeology:

While some of the Qumran biblical manuscripts are nearly identical to the Masoretic, or traditional, Hebrew text of the Old Testament, some manuscripts of the books of Exodus and Samuel found in Cave Four exhibit dramatic differences in both language and content. In their astonishing range of textual variants, the Qumran biblical discoveries have prompted scholars to reconsider the once-accepted theories of the development of the modern biblical text from only three manuscript families: of the Masoretic text, of the Hebrew original of the Septuagint, and of the Samaritan Pentateuch. It is now becoming increasingly clear that the Old Testament scripture was extremely fluid until its canonization around A.D. 100.
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