Acts 13:5

γενόμενοι ἐν Σαλαμῖνι, when they were at Salamis. Salamis was the nearest port of Cyprus for voyagers from Seleucia. It is at the eastern end of the island in the bay which is now called Famagousta.

ἐν ταῖς συναγωγαῖς τῶς Ἰουδαίων, in the synagogues of the Jews, who were in sufficient numbers in Salamis to need several synagogues.

εἶχον δὲ καὶ Ἰωάννην ὑπηρέτην, and they had also John as their minister. This is John Mark, the nephew of Barnabas (see on Acts 12:12). His office may have been to baptize, from which service the Apostles seem to have refrained where it was possible (see above on Acts 10:48). But there is perhaps also implied in the word ὑπηρέτης some degree of the same service which in old times Elisha rendered to Elijah (2 Kings 3:11). The same Greek word is used for the minister in a synagogue (Luke 4:20).