Acts 19:22 mentions Erastus as Paul's helper in Macedonia, confirming he was a trusted companion who stayed in Corinth.

Acts 20:4 lists Trophimus among Paul's travel companions from Asia, the same man left sick in Miletus.

Acts 21:29 identifies Trophimus as an Ephesian, explaining why he was with Paul and later fell ill at Miletus.

Romans 16:23 identifies Erastus as Corinth's city treasurer, providing background for why he stayed in Corinth.

Acts 20:15 records Paul's arrival at Miletus, the very city where he later left Trophimus sick.

Acts 20:17 shows Paul at Miletus summoning Ephesian elders, the same location where Trophimus was left sick.

Acts 18:1 records Paul's first visit to Corinth, the city where Erastus stayed — providing background for Paul's ministry network.