1 Corinthians 16:3

By your letters] of commendation to the Christians at Jerusalem: cp. 2 Corinthians 3:1; Delegates would go from Corinth to avoid all suspicion of misappropriation of the money (2 Corinthians 8:19).

(h) 16:5-24. Personal Messages and Conclusion

5. I do pass through Macedonia] i.e. this is my present intention. His original plan had been to go direct to Corinth (2 Corinthians 1:15), but only for a passing visit.