LSJ
speak Persian, X. An. 4.5.34, Porph. Abst. 3.5, etc.
imitate the Persians, τῇ τε σκευῇ καὶ τῇ φωνῇ Arr. An. 7.6.3, cf. Str. 11.11.8.
take the side of the Persians, Id. 14.2.17.
take the side of Perseus, D.S. 30.5a.
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)