Acts 12:12,25
And when he had considered the thing, he came to the house of Mary the mother of John, whose surname was Mark; where many were gathered together praying.
Nave's Topical Index—AKJV

Acts 13:5,13
And when they were at Salamis, they preached the word of God in the synagogues of the Jews: and they had also John to their minister.
Nave's Topical Index—AKJV