A.T. Robertson Commentary Acts 13:4

"So they, being sent forth by the Holy Spirit, went down to Seleucia; and from thence they sailed to Cyprus." — Acts 13:4 (ASV)

So they (αυτο μεν ουν). They themselves indeed therefore. No contrast is necessary, though there is a slight one in verses 5,6. Luke again refers to the Holy Spirit as the source of their authority for this campaign rather than the church at Antioch.

Sent forth (εκπεμφθεντες). Old verb from εκπεμπω and first aorist passive participle, but in the N.T. only here and Ac 17:10.

Sailed (απεπλευσαν). Effective aorist active indicative of αποπλεω, old verb to sail away, depart from. In the N.T. only here and 14:26; 20:15; 27:1. Barnabas was from Cyprus where there were many Jews.