Acts 16:21
And teach customs, which are not lawful for us to receive, neither to observe, being Romans.
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.