Abbott-Smith Manual Greek Lexicon
μήν (G3375)
1 μήν , a particle of assurance, verily , truly ; εἰ ( εἶ ) μ. (= cl., ἦ μ. in LXX and π. ), now verily , full surely : He 6:14 (LXX) .†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain