Barnabas was not numbered among the twelve apostles, but the book of Acts gives him that title. After Paul was converted to Christianity, Barnabas welcomed him to Jerusalem, and later the two traveled together on missionary journeys.
We praise you, O God, for the life of your faithful servant Barnabas, who, seeking not his own renown but the well-being of your church, gave generously of his life and possessions for the relief of the poor and the spread of the gospel. Grant that we may follow his example and by our actions give glory to you, Father, Son, and Holy Spirit, now and forever. Amen.