'Customs' in the Bible

They are publicly teaching customs which are unlawful for us, as Romans, to accept or observe.”

Now they have been told about you, that you are teaching all the Jews who are living among the Gentiles to turn away from [the Law of] Moses, advising them not to circumcise their children or to live according to the [Mosaic] customs.

especially because you are an expert [fully knowledgeable, experienced and unusually conversant] in all the Jewish customs and controversial issues; therefore, I beg you to listen to me patiently.

Three days later he called together the leaders of the Jews; and when they had gathered, he said to them, “Kinsmen, though I have done nothing against our people or against the customs of our fathers, yet I was turned over as a prisoner from Jerusalem into the hands of the Romans.