Whose authority are we under as Christians- Peter defended his ministry to the Gentiles asking a rhetorical question to the accusation made, -Who am I to withstand God--. The Gospel spread rapidly, as the hand of the Lord was with them, and others were called to assist. Barnabas exhorted them to -Cleave to the Lord with purpose of heart-. We should do the same remembering we are under Christ and His authority.