Acts 21:18 - Albert Barnes' Notes on the Bible

Unto James - James the Less. See the notes on Acts 15:13. He resided at Jerusalem. Compare Galatians 1:19. It is not improbable that he was the only one of the apostles then at Jerusalem; and there is reason to believe that the church at Jerusalem was left under his particular care. It was natural, therefore, that Paul and his companions should take an early opportunity to see him. James was the cousin of our Lord, and in Galatians 1:19 he is called the Lord’s brother. On all accounts, therefore, he was entitled to, and would receive, particular respect from the early disciples.