Thus saith the Lord of hostes, the God of Israel, of Ahab the sonne of Kolaiah, and of Zedekiah the sonne of Maaseiah, which prophecie lyes vnto you in my Name, Beholde, I will deliuer them into the hande of Nebuchad-nezzar King of Babel, and he shall slay them before your eyes.
Jeremiah 29:19 Because they haue not hearde my words, saith the Lord, which I sent vnto them by my seruantes the Prophetes, rising vp earely, and sending them, but yee woulde not heare, saith the Lord.
Jeremiah 29:20 Heare ye therefore the word of the Lord all ye of the captiuitie, whome I haue sent from Ierusalem to Babel.
Jeremiah 29:21 Thus saith the Lord of hostes, the God of Israel, of Ahab the sonne of Kolaiah, and of Zedekiah the sonne of Maaseiah, which prophecie lyes vnto you in my Name, Beholde, I will deliuer them into the hande of Nebuchad-nezzar King of Babel, and he shall slay them before your eyes.
Jeremiah 29:22 And al they of the captiuitie of Iudah, that are in Babel, shall take vp this curse against them, and say, The Lord make thee like Zedekiah and like Ahab, whome the King of Babel burnt in the fire,
Jeremiah 29:23 Because they haue committed vilenie in Israel, and haue committed adulterie with their neighbours wiues, and haue spoken lying words in my Name, which I haue not commanded them, euen I knowe it, and testifie it, saith the Lord.
The verse centers on "thus", "saith", "lord", "hostes", "israel", "ahab", "sonne", and "kolaiah". It is saying that the verse draws attention to "thus" and "saith", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 20's "Heare ye therefore the word of the..." into verse 22's "And al they of the captiuitie of...", so "thus" and "saith" belong inside that flow. In Jeremiah context, the local focus is covenant, worship, and faithfulness.
A plain takeaway is to answer the verse's own emphasis on "thus" and "saith" with trust shaped by these words, not by a vague optimism outside the passage.