Barnabas could see that the grace of God was upon the believers of Antioch

[Acts 11:22-24] Then news of these things came to the ears of the church in Jerusalem, and they sent out Barnabas to go as far as Antioch. When he came and had seen the grace of God, he was glad, and encouraged them all that with purpose of heart they should continue with the Lord. For he was a good man, full of the Holy Spirit and of faith. And a great many people were added to the Lord.