STRONGS G226:
													
												
									    		ἀληθεύω; in secular writings ([Aeschylus], Xenophon, Plato, Aristotle, others) 
to speak the truth;
a. to teach the truth: 
τινί Galatians 4:16.
b. to profess the truth (true doctrine): 
Ephesians 4:15. [
R. V. marginal reading in both passages, 
to deal truly.] 
    THAYER’S GREEK LEXICON, Electronic Database.
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