A.T. Robertson 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 themselves also prophets (κα αυτο προφητα οντες). As well as Paul and Barnabas and like Agabus (11:27-30), for-speakers for Christ who justify the commendation in the letter (verse 27) "with many words" (δια λογου πολλου), "with much talk," and no doubt with kindly words concerning the part played at the Conference by Paul and Barnabas.

Confirmed (επεστηριξαν). See on 14:22. It was a glorious time with no Judaizers to disturb their fellowship as in 1-3.