Jeremiah 45:4

Thus … him omit as a gloss. Baruch himself, not the prophet, is still addressed.

Behold, that which I have built, etc.] Baruch is pained at the calamities in which his country is involved, but let him be sure that the Lord, in bringing Himself to overthrow His cherished people, can only be thus acting because no other course is possible (see introd. note).

and this … land probably a gloss (LXX omit). If the clause stands, the reference is to the overthrow of kingdoms by Nebuchadnezzar.