Charles Ellicott Commentary Acts 16:4

"And as they went on their way through the cities, they delivered them the decrees to keep which had been ordained of the apostles and elders that were at Jerusalem." — Acts 16:4 (ASV)

They delivered them the decrees.—The number of copies which the process implies is in itself a sufficient guarantee that what St. Luke gives is a faithful transcript. The decrees were clearly still regarded by the Gentile converts as being the charter on which they might take their stand in any dispute with the Judaisers, and doubtless helped to determine many who had previously hesitated, to seek admission into the Church.