Conversation so far:
who was put in the lion's den in the bible
Daniel was the biblical figure put in the lion's den.
who put Daniel in the lions' den?
Darius put Daniel in the lion's den.
what happens to Daniel in the lions' den?
God shuts up the mouths of the lions, and the next morning Darius rejoices to find him unharmed.
what is the book of daniel about?
The book of Daniel is an account of the activities and visions of Daniel, a noble Jew exiled at Babylon.

Question: what language was the book written in?
Self-contained rewrite: what language was the book of daniel written in?