Abbott-Smith Manual Greek Lexicon
λευκαίνω (G3021)
2 λευκαίνω ( λευκός ), [in LXX: Ps 50 (51):7 , Is 1:18 ( לבן hi.), etc.;] to whiten , make white : c. acc. rei, Mk 9:3 , Re 7:14 .†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain