Cross reference
Acts 15:27
27 we have sent, therefore, Judas and Silas, and they by word are telling the same things.
Acts 15:22
22 Then it seemed good to the apostles and the elders, with the whole assembly, chosen men out of themselves to send to Antioch with Paul and Barnabas -- Judas surnamed Barsabas, and Silas, leading men among the brethren --
Acts 15:32
32 Judas also and Silas, being themselves also prophets, through much discourse did exhort the brethren, and confirm,
2 John 1:12
12 Many things having to write to you, I did not intend through paper and ink, but I hope to come unto you, and speak mouth to mouth, that our joy may be full;
3 John 1:13
13 Many things I had to write, but I do not wish through ink and pen to write to thee,