And [when he] realized [this], he went to the house of Mary, the mother of John (who is also called Mark), where many [people] were gathered together and were praying.

So Barnabas and Saul returned to Jerusalem [when they] had completed [their] service, having taken along with [them] John (who is also called Mark).

Now Barnabas wanted to take John who was called Mark along also,

And a sharp disagreement took place, so that they separated from one another. And Barnabas took along Mark [and] sailed away to Cyprus,