Acts 15:4

they were received of the church "The church" is perhaps named first because there would on such a visit be an assembly of the whole Christian body to hear the story of the missionary labours of Paul and Barnabas before the question about which they had specially been sent from Antioch came to be discussed. The account of the spreading of the faith was for all, while the question of circumcision would be discussed only by the heads of the church, and those who could speak with authority. This preliminary meeting must have lasted for a considerable time, even if only a mere abstract of the labours, sufferings and success of Paul and Barnabas were given to those who met them. Such a recital was the best introduction that could be conceived for the question which was afterwards to be discussed and legislated on.

God had done with them The preposition (μετὰ) implies that the Apostles deemed themselves fellow-workers withGod (cp. Mark 16:20), but that they were only instruments whom God employed is also shewn below (Acts 15:12) where the same labours are spoken of as "what God had wrought among the Gentiles by(διὰ) them."