Luke gives an ideal example of a member of the early Christian community in Jerusalem: Joseph the Levite, also known as Barnabas (4:36). Barnabas is a significant figure in the book of Acts, introduced here as a member of the community at Jerusalem. The introduction of Barnabas at this point in the book is a typical Lukan literary style. He often introduces a character who will become significant later in the story (Saul in 8:1, John Mark and James, Jesus’ brother in chapter 12).
Joseph is a common name in the first century, so his second name might be a nickname. Luke tells us the name means “son of encouragement” although this derivation is not particular obvious. The phrase “son of ” can mean “characterized by, such as calling James and John “sons of thunder.” The name may be related to Bar-nabi, which would mean “son of a prophet.”
While this seems the most likely explanation for the name, it is not exactly what Luke says the name means. The role of the prophet is not limited to future-telling or condemnation of sin. For example, the second half of Isaiah has been rightly described as a “book of comfort” or “consolation.” Perhaps Barnabas had a personality which could speak the truth with strength and clarity, but in such a way as to bring comfort and encouragement to people as well.
Barnabas was from Cyprus. We know a community of Jews was present on Cyprus as early as 330 B.C., but they were expelled in A.D. 117. It is possible that Barnabas was in Jerusalem to serve his time in the Temple, or he may have been living in the city more or less full time. If he was wealthy, then he may have owned property in Jerusalem and Cyprus.
Luke calls him a Levite. Not all Levites were priests, but typically they were wealthy and well educated regardless of their role in the Temple. Levites could be anything from priests to doorkeepers in the Temple, but they also might be scribes or teachers of the Law. We are not told that Barnabas actually functioned as a Levite in the Temple, he may have simply been from a Levitical family. On the other hand, it is possible that he had worked in the Temple and was quite “traditional” within the spectrum of Second Temple Period Judaism. What matters here is that Barnabas was from the Diaspora, but had deep roots in Jerusalem and perhaps the Temple.
Barnabas sells some property and turns the proceeds over to the apostles. This stands in contrast to Ananias in the next paragraph, who claims to do the same thing but is not telling the truth. We are not told what the property is, although he may have owned some property around Jerusalem which was a source of income for his family while he worked in the Temple.
I think that it is important to observe here that Jews living living outside of Judea are not automatically “more liberal” on matters of Law. In fact, it seems to me that the violent resistance to the preaching of the Gospel in Acts comes first from Diaspora Jews, not the Aramaic-speaking Jews. That Barnabas has two Hebrew names, hast the title of Levite, and had some property in Jerusalem implies that he was less Hellenized and more traditional with respect to his religion.
E. Schnabel, Early Christian Mission, 1:788-790 for detailed information on Barnabas.