Acts 16:21

καὶ καταγγέλλουσιν ἔθη ἃ οὐκ ἔξεστιν ἡμῖν παραδέχεσθαι οὐδὲ ποιεῖν, Ῥωμαίοις οὖσιν.

kai kataggelloysin ethē a oyk exestin ēmin paradechesthai oyde poiein, Rōmaiois oysin.

King James Version (KJV)

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

Modern English

by advocating customs unlawful for us Romans to accept or practice.