Lexicon :: Strong's G3362 - ean mē

μή, the Sept. for אַל, אַיִן, אֵין, a particle of negation, which differs from οὐ (which is always an adverb) in that οὐ denies the thing itself (or to speak technically, denies simply, absolutely, categorically, directly, objectively), but μή denies the thought of the thing, or the thing according to the judgment, opinion, will, purpose, preference, of someone (hence, as we say technically, indirectly, hypothetically, subjectively). This distinction holds also of the compounds οὐδείς, μηδείς, οὐκέτι, μηκέτι, etc. But μή is either an adverb of negation, not (Latin non, ne); or a conjunction, that... not, lest (Latin ne); or an interrogative particle (Latin num) (i. e. (generally) implying a neg. ans.; in indirect question, whether not (suggesting apprehension)). Cf. Herm. ad Vig. § 267, p. 802ff; Matthiae, § 608; Alexander Buttmann (1873) Gram. § 148 (cf. Alex. Alexander Buttmann (1873) N. T. Gr., p. 344 (296ff)); Kühner, ii. § 512f, p. 739ff; (Jelf, § 738ff); Rost § 135; Winer's § 55, 56; F. Franke, De particulis negantibus (two commentaries) Rintel. 1832f; G. F. Gayler, Particularum Graeci sermonis negativarum accurata disputatio, etc. Tub. 1836; E. Prüfer, De μή et οὐ particulis epitome. Vratisl. 1836; (Gildersleeve in American Jour. of Philol. vol. i. no. i., p. 45ff; Jebb in Vincent and Dickson's Handbook to Modern Greek, 2nd edition, Appendix, § 82ff).
ἐάν μή, unless, if not, see examples in ἐάν, I. 3 c. ἐάν etc. καί μή, Mark 12:19; ἐάν etc. δέ μή, James 2:14; ἐάν τίς ἴδῃ... μή πρός θάνατον, 1 John 5:16; εἰ μή, εἰ δέ μή, εἰ δέ μήγε, etc., see εἰ, III., p. 171f. To this head belong the formulae that have ἄν or ἐάν as a modifier (Winers Grammar, § 55, 3 e.; (Buttmann, § 148, 4)), ὅς, ὅστις, ὅσοι ἄν or ἐάν μή: Matthew 10:14; Matthew 11:6; Mark 6:11; Mark 10:15; Luke 7:23; Luke 9:5; Luke 18:17; Revelation 13:15; ὅς ἄν etc. καί μή, Mark 11:23; Luke 10:10; ὅς ἄν... μή ἐπί πορνεία, Matthew 19:9 G T Tr WH text; of the same sort is πᾶν πνεῦμα, ὁ μή ὁμολογεῖ, 1 John 4:3.

BLB Scripture Index of Thayer's