“Thus far are the words of Jeremiah.”
Simply stated, this is the classical ending to the Book of Jeremiah. This line is not in the Greek Septuagint text. This book or scroll was tossed into the Euphrates River. There is an appendix attached, but it is mostly a duplicate of chapters 24-25, in 2 Kings, as well as chapter 39 of this work of Jeremiah.
“In the fourteenth year of King Hezekiah,
King Sennacherib of Assyria
Came up against
All the fortified cities of Judah.
He took them.”
This is exactly word for word from 2 Kings, chapter 18. In fact, this whole appendix is closely related to the stories about King Hezekiah of Judah and the Assyrian invasion in 2 Kings, chapters 18-20. Despite all the goodness of King Hezekiah of Judah (716-687 BCE), he suffered a defeat, since King Sennacherib of Assyria (706-681 BCE) took over Judah and its fortified cities. According to an account of King Sennacherib, he had taken 46 towns, but not Jerusalem.