A.T. Robertson Commentary 2 Corinthians 1:16

"and by you to pass into Macedonia, and again from Macedonia to come unto you, and of you to be set forward on my journey unto Judaea." — 2 Corinthians 1:16 (ASV)

And again (κα παλιν). This would have been the second benefit or joy. But he changed his plans and did not make that trip directly to Corinth, but came on to Macedonia first (Acts 19:21; 20:1f.; 1 Corinthians 16:2; 2 Corinthians 2:12).

To be set forward by you (υφ' υμων προπεμφθηνα). First aorist passive infinitive of προπεμπω. Paul uses this same verb in Ro 15:24 for the same service by the Roman Christians on his proposed trip to Spain. The Corinthians, especially the anti-Pauline party, took advantage of Paul's change of plans to criticize him sharply for vacillation and flippancy. How easy it is to find fault with the preacher! So Paul has to explain his conduct.