Acts 15:22, 30-32, 36-40

Then it seemed good to the apostles and the elders, with the whole church, to choose men from among them and send them to Antioch with Paul and Barnabas. They sent Judas called Barsabbas, and Silas, leading men among the brothers

So when they were sent off, they went down to Antioch, and having gathered the congregation together, they delivered the letter. And when they had read it, they rejoiced because of its encouragement. And Judas and Silas, who were themselves prophets, encouraged and strengthened the brothers with many words.

And after some days Paul said to Barnabas, “Let us return and visit the brothers in every city where we proclaimed the word of the Lord, and see how they are.” Now Barnabas wanted to take with them John called Mark. But Paul thought best not to take with them one who had withdrawn from them in Pamphylia and had not gone with them to the work. And there arose a sharp disagreement, so that they separated from each other. Barnabas took Mark with him and sailed away to Cyprus, but Paul chose Silas and departed, having been commended by the brothers to the grace of the Lord.