Charles Ellicott Commentary Jeremiah 30:2

"Thus speaketh Jehovah, the God of Israel, saying, Write thee all the words that I have spoken unto thee in a book." — Jeremiah 30:2 (ASV)

Write you all the words ... — The opening words emphasise the fact that what follows was not spoken at first, like Jeremiah 27 and 28, in the presence of the people, but was from the first committed to writing. There is no definite point at which we may be certain that the section ends, and there is room for many conjectures as to interpolations here and there, but the opening of Jeremiah 32 suggests the conclusion that it takes in the whole of Jeremiah 30 and 31.

The general character of the prophecy, probably in part resulting from the acceptance of the prophet’s teaching by the exiles of Babylon, is one of blessing and restoration. He is thus led on to the great utterance which, from one point of view, makes him more the prophet of the Gospel even than Isaiah. It is here that we find that promise of a New Covenant (Jeremiah 31:31) which, both as a word and a fact, has been prominent in the history of Christendom.