徒 Acts 16:4-5
4 他们经过各城，把耶路撒冷的使徒和长老所定的规条，交给门徒遵守。 5 于是众教会信心越发坚固，人数天天增加。
4 As they traveled from town to town, they delivered the decisions reached by the apostles and elders in Jerusalem for the people to obey. 5 So the churches were strengthened in the faith and grew daily in numbers.
By this example, Luke urges us to continue to make progress in the faith, so that we may not be overtaken at the outset by laziness or neglecting to learn. The way to increase faith is also described; this occurs when the Lord rouses us by the work of his servants, as he did with Paul and his companions.
Here Luke is commending another result of preaching and suggests that the more progress is made by those who are first called to faith, the more people they will lead to Christ, as faith spreads to others by propagation.