Acts 16:21
"And teach customs, which are not lawful for us to receive, neither to observe, being Romans."
Cross References (ranked by relevance)
And Haman said unto king Ahasuerus, There is a certain people scattered abroad and dispersed among the people in all the provinces of thy kingdom; and their laws are diverse from all people; neither keep they the king’s laws: therefore it is not for the king’s profit to suffer them.
Especially because I know thee to be expert in all customs and questions which are among the Jews: wherefore I beseech thee to hear me patiently.
And from thence to Philippi, which is the chief city of that part of Macedonia, and a colony: and we were in that city abiding certain days.
For the customs of the people are vain: for one cutteth a tree out of the forest, the work of the hands of the workman, with the axe.