So they (autoi men oun). They themselves indeed therefore. No contrast is necessary, though there is a slight one in Act 13:5, Act 13:6. Luke again refers to the Holy Spirit as the source of their authority for this campaign rather than the church at Antioch.
Sent forth (ekpemphthentes). Old verb from ekpempō and first aorist passive participle, but in the N.T. only here and Act 17:10.
Sailed (apepleusan). Effective aorist active indicative of apopleō, old verb to sail away, depart from. In the N.T. only here and Act 14:26; Act 20:15; Act 27:1. Barnabas was from Cyprus where there were many Jews.