{For} (hoti). Because. This is the explanation of the
conduct of Barnabas. The facts were opposed to the natural
prejudices of a Jew like Barnabas, but he rose above such racial
narrowness. He was a really good man (agathos). See  Ro 5:7 
for distinction between agathos and dikaios, righteous, where
agathos ranks higher than dikaios. Besides, Barnabas was full
of the Holy Spirit (like Peter) and of faith and so willing to
follow the leading of God's Spirit and take some risks. This is a
noble tribute paid by Luke. One wonders if Barnabas was still
living when he wrote this. Certainly he was not prejudiced
against Barnabas though he will follow the fortunes of Paul after
the separation ( 15:36  41 ). {Was added unto the Lord}
(proseteth(8820)t(9369) kuri(9369)). First aorist passive indicative of
prostith(886d)i, common verb to add to. These people were added to
the Lord Jesus before they were added to the church. If that were
always true, what a difference it would make in our churches.