Lexical Definition

‎ἑαυτοῦ‎ heautoû (heh-ow-too') themself ^G:F-3
from a reflexive pronoun otherwise obsolete and the genitive case (dative case or accusative case) of ‎αὐτός‎

alone, her (own, -self), (he) himself, his (own), itself, one (to) another, our (thine) own(-selves), + that she had, their (own, own selves), (of) them(-selves), they, thyself, you, your (own, own conceits, own selves, -selves).

• him- (her-, it-, them-, also (in conjunction with the personal pronoun of the other persons) my-, thy-, our-, your-) self (selves), etc.

Abbott-Smith

ἑαυτοῦ, -ῆς, -οῦ, dat. -ῷ, etc., acc. -όν, etc., pi. -ῶν, etc. (Att. contr. αὑτοῦ, etc); reflex pron.;

1. prop, of 3rd person (Lat. sui, sibi, se), of himself, herself, itself, etc.: Mt 27:42, Mk 15:31, Lk 23:35, al.; added to a middle verb, διεμερίσαντο ἑαυτοῖς, Jo 19:24; to an active verb, Ac 14:14 (M, Pr., 157); ἀφ’ ἑαυτοῦ, Lk 12:57 21:30, Jo 5:19, al. (v.s. ἀπό); δι’ ἑαυτοῦ, Ro 14:14; ἐν ἑ., Mt 3:9, Mk 5:30, al.; εἰς ἑ., Lk 15:17; καθ’ ἑαυτόν, Ac 28:16, Ja 2:17; παρ’ ἑαυτῷ, at his own house, I Co 16:2; πρὸς ἑ., with, to himself, Lk 18:11; as poss. pron. (with emphasis weakened; v. M, Pr., 87f.), τ. ἑαυτῶν νεκρούς, Lk 9:60.
2. As reflexive 1st and 2nd pers. (so also freq. in cl., chiefly poetry), Mt 23:31, Mk 9:50, Ro 8:23, I Th 2:8, al.
3. In pl., for reciprocal pron., ἀλλήλων, -οις, -ους, of one another, etc.: Mt 21:38, Mk 16:3, Eph 5:19, al.

Abbott-Smith References

Liddell-Scott-Jones

ἑαυτοῦ, ῆς, οῦ, ἑαυτῷ, ῇ, ῷ, ἑαυτόν, ήν, ό,

plural ἑαυτῶν, ἑαυτοῖς, ἑαυτούς άς, ά: Ionic dialect ἑωυτοῦ [Refs 5th c.BC+]; also ωὑτῆς [Refs 3rd c.BC+] in Papyrus and Inscrr., as [Refs 1st c.BC+]: Attic dialect contraction αὑτοῦ, etc., which is the usual form in Trag., though ἑαυτοῦ, etc., are used (though rarely) when the metre requires, [Refs 4th c.BC+]; Cretan dialect ϝιαυτοῦ Kohler-Ziebarth Stadtrecht von Gortyn [Refs]; Doric dialect αὐταυτοῦ, αὐσαυτοῦ (which see); Thess. εὑτοῦ (dative), [Refs]: genitive plural ηὑτῶν [Refs]:—reflexive pronoun of 3rd pers., of himself, herself, itself, etc.; first in [Refs 7th c.BC+], and Attic dialect [Refs 8th c.BC+] itself by itself, absolutely, [Refs 5th c.BC+]; αὐτὸ ἐφ᾽ αὑτοῦ[Refs 5th c.BC+]; ἀφ᾽ ἑαυτῶν, ἑαυτοῦ, of themselves, himself, [Refs 5th c.BC+]; ἐφ᾽ ἑαυτοῦ, see at {ἐπ; ἐν ἑαυτῷ γίγνεσθαι}, ἐντὸς ἑαυτοῦ γ., see at {ἐν}, ἐντό; παρ᾽ ἑαυτῷ at his own house, [Refs]themselves, [Refs 5th c.BC+]; πλουσιώτεροι ἑαυτῶν continually richer, [Refs 5th c.BC+], compare d; τῇ αὐτὸ ἑωυτοῦ ἐστι μακρότατον at its very greatest length, [Refs 5th c.BC+]

__II in Attic dialect, Trag., and later, αὑτοῦ, etc., is used for the 1st pers. or 2nd pers., as for ἐμαυτοῦ, αὐτὸς καθ᾽ αὑτοῦ τἄρα μηχανορραφῶ [Refs 5th c.BC+]; ἐφ᾽ ἑαυτοῖς by ourselves, [LXX+2nd c.BC+]; ἑαυτῶν, ={ὑμῶν αὐτῶν}, [Refs 2nd c.BC+]
__III plural, ἑαυτῶν, ἑαυτοῖς, etc., is sometimes used for ἀλλήλων, ἀλλήλοις, one another, διάφοροι ἑωυτοῖσι [Refs 5th c.BC+]; καθ᾽ αὑτοῖν one against the other, [Refs 5th c.BC+]

_{LSJ Scripture Refs: LXX.1Kgs.14.9 ☩ 2Cor.7.1}