Albert Barnes Commentary Acts 19:22

"And having sent into Macedonia two of them that ministered unto him, Timothy and Erastus, he himself stayed in Asia for a while." — Acts 19:22 (ASV)

Timotheus. Timothy. He was a proper person to send there to visit the churches, as he had been there before with Paul when they were established, Acts 16:3; Acts 17:14.

And Erastus. Erastus was chamberlain of Corinth (Romans 16:23), or, more properly, the treasurer of the city (see Barnes on Romans 16:23); and he was, therefore, a very proper person to be sent with Timothy for the purpose of making the collection for the poor at Jerusalem. Paul had wisdom enough to employ a man accustomed to monied transactions in making a collection. On this collection his heart was intent, and he afterwards went up with it to Jerusalem (2 Corinthians 8; 2 Corinthians 9).

Stayed in Asia. At Ephesus.

For a season. How long is uncertain. He waited for a convenient opportunity to follow them; probably intending to do it as soon as they had fully prepared the way for the collection. See Paley's Horae Paulinae, p. 1, chap. ii.