Nebuchadnezzar wrote a letter to everyone on earth to tell then about his dream. He asked his wise men to interpret it, but they couldn't. So he asked Daniel to do it.
Daniel explained it all to him, saying that his kingdom would be taken away from him and he'd eat grass like an ox for seven times (whatever that might mean). And that's exactly what happened!
After Neb returned from eating grass with the animals, he became a Jew again. (As he did after Daniel interpreted his first dream.)
The text and notes for this episode can be found here: https://skepticsannotatedbible.com/fewer-words/212.html
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