Albert Barnes Commentary Acts 15:32

"And Judas and Silas, being themselves also prophets, exhorted the brethren with many words, and confirmed them." — Acts 15:32 (ASV)

Being prophets. (See Barnes on Acts 11:27).

This evidently implies that they had been preachers before they went to Antioch. What was the precise nature of the office of a prophet in the Christian church, it is not easy to ascertain. Possibly it may imply that they were teachers of unusual or remarkable ability.

Confirmed them. Strengthened them; that is, by their instructions and exhortations. (See Barnes on Acts 14:22).