Acts.19.22  And having sent into Macedonia two of his helpers, Timothy and Erastus, he himself stayed in Asia for a while.
Rom.16.23  Gaius, who is host to me and to the whole church, greets you. Erastus, the city treasurer, and our brother Quartus, greet you.
2Tim.4.20  Erastus remained at Corinth; Trophimus I left ill at Miletus.

Hyper-concordance v1.1, by Sean Boisen. Scripture verses taken from the Revised Standard Version, copyright 1952, 1971.