(21) And teach customs.--The word is used as including ritual as well as social habits, and seems to have been specially used of the whole system of Jewish life. (See Notes on Acts 6:14; Acts 15:1; Acts 21:21.)

Being Romans.--The people of Philippi, as a colonia, had a right to claim the title of Roman citizens, which could not have been claimed by those who were merely inhabitants of a Greek city, such as Thessalonica or Corinth. (See Note on Acts 16:12.)

Verse 21. - Set forth for teach, A.V.; it is for are, A.V.; or for neither, A.V. Romans; in a special sense, as members of a colony.

16:16-24 Satan, though the father of lies, will declare the most important truths, when he can thereby serve his purposes. But much mischief is done to the real servants of Christ, by unholy and false preachers of the gospel, who are confounded with them by careless observers. Those who do good by drawing men from sin, may expect to be reviled as troublers of the city. While they teach men to fear God, to believe in Christ, to forsake sin, and to live godly lives, they will be accused of teaching bad customs.And teach customs,.... 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 worship, a new or strange deity, without the decree of the senate (l).

(l) Tertull. Apolog. c. 5. Euseb. Eccl. Hist. l. 2. c. 2.