Jeremiah had written on a single scroll about all the disaster that would come upon Babylon--all these words that had been written concerning Babylon.

Isaiah 30:8
Go now, write it on a tablet in their presence and inscribe it on a scroll; it will be for the days to come, a witness forever and ever.

Jeremiah 30:2
"This is what the LORD, the God of Israel, says: 'Write in a book all the words that I have spoken to you.

Jeremiah 30:3
For behold, the days are coming, declares the LORD, when I will restore from captivity My people Israel and Judah, declares the LORD. I will restore them to the land that I gave to their fathers, and they will possess it.'"

Jeremiah 36:2
"Take a scroll and write on it all the words I have spoken to you concerning Israel, Judah, and all the nations, from the day I first spoke to you during the reign of Josiah until today.

Jeremiah 36:4
So Jeremiah called Baruch son of Neriah, and at the dictation of Jeremiah, Baruch wrote on a scroll all the words that the LORD had spoken to Jeremiah.

Jeremiah 51:61
And Jeremiah said to Seraiah, "When you get to Babylon, see that you read all these words aloud,

So Jeremiah wrote in a book all the evil that should come on Babylon, even all these words that are written against Babylon.