The find
Between November 1946 and February 1947, three Bedouin shepherds were in the cliffs above the Dead Sea, near a place called Qumran. One of them, Muhammed edh-Dhib, found a cave with clay jars inside.
In the jars were seven ancient scrolls. One of them was the whole book of Isaiah.
Eleven caves
Over the next ten years, shepherds and archaeologists searched the caves along the cliffs. By the end, eleven caves had given up their scrolls. Scholars have pieced together 981 different manuscripts, from thousands of fragments.
They were copied between the third century BC and the first century AD. Many of them are older than Jesus.
Every book but one
More than a fifth of the scrolls are books of the Bible. Among them is a copy, or part of a copy, of every book of the Hebrew Bible except one, the book of Esther.
A thousand years older
Before 1947, the oldest Hebrew copies of the Old Testament were from the tenth century AD, like the Aleppo Codex. Every Bible in the world was translated from copies made a thousand years and more after the prophets wrote.
People asked a fair question. After a thousand years of copying by hand, how much had changed?
The Dead Sea Scrolls answered it. Scholars could now set a copy of Isaiah from around 125 BC beside one from the Middle Ages.
After a thousand years of copying, the text of Isaiah was the same book. The differences are mostly spelling and small slips of the pen. The message hadn't changed.
Before Jesus
There's a second thing the scrolls prove. The prophecies about Jesus were already written down before he was born.
The scroll of Isaiah, copied around 125 BC, contains Isaiah 53 in full, the servant who would be "wounded for our iniquities" and "led as a sheep to the slaughter." Nobody wrote it after the fact. It was sitting in a jar by the Dead Sea while the world waited.
Why this is a big deal
For a thousand years, nobody could check the copies against anything older. Then a shepherd walked into a cave, and the check came out of the ground.
The words had come through a thousand years of copying intact. "The grass is withered, and the flower is fallen: but the word of our Lord endureth for ever" (Isaias 40:8).