Abbott-Smith Manual Greek Lexicon
ἀληθεύω (G226)
2 ἀληθεύω ( ἀληθής ), [in LXX: Ge 20:16 ( יָכַח ) Ge 42:16 ( אֶמֶת ), Pr 21:3 ( מִשְׁפָּט ), Is 44:26 ( שָׁלַם ), Si 34:4 *;] to speak the truth (R, mg., deal truly ; Field, Notes , 192): Ga 4:16 , Eph 4:15 .†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain