Jeremiah 29:1
Now these are the words of the letter that Jeremiah the prophet sent from Jerusalem unto the residue of the elders which were carried away captives, and to the priests, and to the prophets, and to all the people whom Nebuchadnezzar had carried away captive from Jerusalem to Babylon;
Cross-reference
Jeremiah 29:25-29 describes Shemaiah's letters to Jerusalem—contrasting with Jeremiah's true letter to the exiles.
Jeremiah 29:28 quotes Shemaiah's objection to this very letter — showing opposition to Jeremiah's message.
Jeremiah 24:1-7 identifies the exiles in Babylon as the 'good figs' — the same group Jeremiah writes to in this letter.
Jeremiah 28:4 contains Hananiah's false promise of a quick return — contrasting with Jeremiah's instruction to settle in exile.
Jeremiah 51:61 also involves sending a written prophecy to Babylon — another instance of Jeremiah's written messages to exiles.
Jeremiah 28:17 confirms Jeremiah's prophetic authority by Hananiah's death — background to the letter he sends here.
Jeremiah 33:9 promises future restoration and joy — the eventual hope after the exile addressed here.
2 Kings 24:12 records Jeconiah's surrender to Nebuchadnezzar — the event that led to the exile of those receiving this letter.