"...in 1947, some Bedouin shepherds were looking for some lost sheep in the hill sides surrounding the Dead Sea in Israel. One of the shepherds threw a rock into a distant cave and heard the sound of pottery shattering.
...What scholars discovered was not just one cave, but eleven caves. Instead of a few manuscripts, scholars uncovered a library of writings from the Essene community including various books from the Old Testament, commentaries on Old Testament books, and other extra-Biblical literature.
Interestingly, these writings included parts of every single book of the Old Testament minus the book of Esther. Perhaps the most interesting discovery was an almost complete Isaiah scroll. When scholars compared the Isaiah scroll to our earliest copies of Isaiah previous to then (900 to 1000 A.D.), they found that there were only about 13 textual variations. Regarding Isaiah 53, which predicts the suffering and death of Jesus, they only found one variation in the entire chapter that had any possible significance: putting "light" in Isaiah 53:11." (Ryan Turner, CARM.org, "Has the Old Testament been corrupted?")