 That was the exile to Babylonia. We have no copy of the Bible dating from before that time. No pre-exilic copy. I am certain there are pre-exilic copies. So it's like the missing link. That's right. And it's a funny thing, the further we get away from those events, way back 2,000 years ago, 2,500 years ago, 3,000 years ago, the more we find out about it. It's the inversion of history.