Romans 16:23
Gaius, who is hosting me [i.e., Paul] and the whole church [here], sends you his greetings. [Note: This was probably the Gaius who lived in Corinth (I Cor. 1:14) and was apparently both wealthy and generous]. Erastus, the city treasurer [of Corinth] sends his greetings to you, along with our brother Quartus. {{Some manuscripts contain verse 24), which repeats the benediction of verse 20}}
Acts 19:22
After sending his two associates Timothy and Erastus on to Macedonia [Note: These were men who cared for various needs of his ministry], Paul remained in [the province of] Asia for a while.
1 Corinthians 1:14
I am thankful that I did not immerse any of you, except for Crispus and Gaius,
2 Timothy 4:20
Erastus stayed on at Corinth, but I left Trophimus sick at Miletus.
3 John 1:1-6
[This is being written by] the elder to my dear [friend] Gaius, whom I love in the truth. [Note: This may mean "whom I truly love"].
Acts 19:29
The city became full of confusion; they grabbed Gaius and Aristarchus, Paul's Macedonian traveling companions, and everyone together rushed into the amphitheater.
Acts 20:4
and 5], where we remained for seven days.