Acts 16:21

“And teach customs, etc.] The Vulgate Latin and Ethiopic versions read in the singular number, “custom or law”; referring to the doctrine of salvation by Christ, in whose name the spirit of divination was cast out of the maid, and whom they took for a new deity; and so concluded that the apostle and his company were introducing a new religious law or custom, the worship of another God: which are not lawful for us to receive, neither to observe, being Romans; for the city of Philippi was a Roman colony, and so the inhabitants of it called themselves Romans; or these men might be strictly such, who were transplanted hither; and with the Romans, it was not lawful to receive, observe, and…”

“And teach customs, which are not lawful for us to receive, neither to observe, being Romans--Here also there was a measure of truth; as the introduction of new gods was forbidden by the laws, and this might be thought to apply to any change of religion. But the whole charge was pure hypocrisy; for as these men would have let the missionaries preach what religion they pleased if they had not dried up the source of their gains, so they conceal the real cause of their rage under color of a zeal for religion, and law, and good order: so Act 17:6-7; Act 19:25, Act 19:27.”

“And teach customs - The word “customs” here ἔθη ethē refers to “religious rites or forms of worship.” See the notes on Acts 6:14. They meant to charge the apostles with introducing a new religion which was unauthorized by the Roman laws. This was a cunning and artful accusation. It is perfectly evident that they cared nothing either for the religion of the Romans or of the Jews. Nor were they really concerned about any change of religion. Paul had destroyed their hopes of gain; and as they Could not prevent that except by securing his punishment or expulsion, and as they had no way of revenge except by endeavoring to excite indignation against him and Silas for violating the laws, they…”

“And teach customs which it is not lawful for us to receive - The world has received all the rules and doctrines of all the philosophers that ever were. But this is a property of Gospel truth: it has something in it peculiarly intolerable to the world. Acts 16:23”

“Act 26:3; Jer 10:3 Acts 16:22”