2 Corinthians 8:19

and not only so, but who was also appointed by the churches to travel with us in the matter of this grace, which is ministered by us to the glory of the Lord, and to show our readiness [Paul is commending those whom he sent to gather the collections. Luke's primary commendation is his general character revealed in his love for the gospel facts; his further qualification is his appointment by the churches in Macedonia to assist in this very work. He had resided in Macedonia for some six years, or since Paul had first come to Philippi, and so was well known and fully trusted by the Macedonians. He was appointed that the glory of Christ might not be tarnished by any suspicion that the money was raised for selfish purposes, and that Paul's zeal to raise the money might not be regarded with evil surmises]: