Romans 16:23

“Gaius mine host, etc..] There was one Gaius a Macedonian, that was with the apostle at Ephesus, (<441929>Acts 19:29); and another Gaius of Derbe, that accompanied him into Asia, (<442004>Acts 20:4); whether either of these, as the latter seems more probable, was this person, is not certain. However, it seems very likely that it is the same Gaius the apostle baptized at Corinth, (<460114>1 Corinthians 1:14); and some have thought him to be the same that the Apostle John wrote his third epistle to, and indeed the characters of hospitality and generosity there given him well agree with this, who was not only the apostle's host that entertained him in a kind and liberal manner, but of all the…”

“Gaius mine host, and--the host of the whole church--(See Act 20:4). It would appear that he was one of only two persons whom Paul baptized with his own hand (compare Jo3 1:1). His Christian hospitality appears to have been something uncommon. Erastus the chamberlain--"treasurer." of the city--doubtless of Corinth. (See Act 19:22; Ti2 4:20). and Quartus a brother--rather, "the" or "our brother"; as Sosthenes and Timothy are called (Co1 1:1; Co2 1:1, Greek). Nothing more is known of this Quartus.”

“Gaius mine host - Who has received me into his house, and shown me hospitality. The word “host” means one who entertains another at his own house without reward. And of the whole church - Who has opened his house to entertain “all” Christians; or to show hospitality to them all. He was baptized by Paul himself at Corinth 1 Corinthians 1:14; and was so highly esteemed by the church that John wrote an epistle to him; 3 John 1:1. He was probably a wealthy citizen of Corinth, who freely opened his house to entertain Christians, and for the purpose of religious worship. Erastus - Erastus is mentioned Acts 19:22 as having been sent by Paul with Timothy into Macedonia. He is also mentioned 2…”

“The chamberlain of the city - Of Corinth. Romans 16:25”

“16:23 This Erastus was probably the individual Paul sent from Ephesus to Macedonia during his third missionary journey (Acts 19:21-22; see 2 Tim 4:20). An inscription in Corinth mentions an Erastus who was a city magistrate, possibly the same Erastus mentioned here.”

“Gaius: Co1 1:14; Jo3 1:1-6 Erastus: Act 19:22; Ti2 4:20 the chamberlain: Or, as the Vulgate renders, arcarius civitatis, "the treasurer (or steward, οικονομος \[Strong's G3623\],) of the city;" he to whom the receipt and expenditure of the public money were entrusted. Romans 16:24”