Canon 37
About the prohibition of accepting holiday gifts from heretics and Jews, and participating in their religious holidays.
That one should not accept holiday gifts sent by Jews or heretics and celebrate with them.
Greek original
Ὅτι οὐ δεῖ παρὰ τῶν Ἰουδαίων, ἢ αἱρετικῶν, τὰ πεμπόμενα ἑορταστικὰ λαμβάνειν, μηδὲ συνεορτάζειν αὐτοῖς.
Parallel canons
Ап.647071Трул.11Анкир.9Лаод.62938