2 Corinthians 1:16
And to pass by you into Macedonia, and to come again out of Macedonia unto you, and of you to be brought on my way toward Judea.
Cross-reference
2 Corinthians 7:5 describes Paul's arrival in Macedonia, which is the next step after the travel plan outlined in 1:16.
Acts 19:21 records the same travel plan: Paul intended to go to Jerusalem via Macedonia and Achaia, confirming the itinerary in 2 Cor 1:16.
1 Corinthians 16:5-7 is the earlier statement of this exact plan: Paul will come to Corinth after Macedonia and be sent on.
1 Corinthians 16:6 uses the same phrase 'help me on my journey' (propempo) within the same travel plan Paul references in 2 Cor 1:16.
Acts 19:22 shows Paul sending Timothy and Erastus to Macedonia, a practical step in executing the plan mentioned in 2 Cor 1:16.
Romans 15:24 uses the same Greek term 'propempo' for Paul being sent on his way, but for a journey to Spain rather than Judea.