ἁγιάζω

1 aorist ἡγίασα; passive (present ἁγιάζομαι; perfect ἡγίασμαι; 1 aorist ἡγιάσθην; a word for which the Greeks use ἁγίζειν, but very frequent in Biblical (as equivalent to קִדַשׁ, הִקְדִישׁ) and ecclesiastical writings; "to make ἅγιον, render or declare sacred or holy, consecrate". Hence, it denotes:
1. to render or acknowledge to be venerable, to hallow: τό ὄνομα τοῦ Θεοῦ, Mt 6:9 (so of God, Isa 29:23; Ezek 20:41; Ezek 38:23; Sir. 33:4 (Sir. 36:4)); (Lk 11:2); τόν Χριστόν, 1 Pet 3:15 (R G Θεόν). Since the stamp of sacredness passes over from the holiness of God to whatever has any connection with God, ἁγιάζειν denotes
2. to separate from things profane and dedicate to God, to consecrate and so render inviolable;
a. things (πᾶν πρωτότοκον, τά ἀρσενικά, Deut 15:19; ἡμέραν, Ex 20:8; οἶκον, 2 Chr 7:16, etc.): τόν χρυσόν, Mt 23:17; τό δῶρον, Mt 23:19; σκεῦος, 2 Tim 2:21.
b. persons. So Christ is said by undergoing death to consecrate himself to God, whose will he in that way fulfills, Jn 17:19; God is said ἁγιάσαι Christ, i. e. to have selected him for his service (cf. ἀφορίζειν, Gal 1:15) by having committed to him the office of Messiah, Jn 10:36, cf. Jer 1:5; Sir. 36:12 (ἐξ αὐτῶν ἡγίασε, καί πρός αὐτόν ἤγγισεν, of his selection of men for the priesthood); Sir. 45:4 Sir. 49:7. Since only what is pure and without blemish can be devoted and offered to God (Lev 22:20; Deut 15:21; Deut 17:1), ἁγιάζω signifies
3. to purify (ἀπό τῶν ἀκαθαρσιῶν is added in Lev 16:19; 2 Sam 11:4); and
a. to cleanse externally (πρός τήν τῆς σαρκός καθαρότητα), to purify levitically: Heb 9:13; 1 Tim 4:5.
b. to purify by expiation, free from the guilt of sin: 1 Cor 6:11; Eph 5:26; Heb 10:10, Heb 10:14, Heb 10:29; Heb 13:12; Heb 2:11 (equivalent to כִּפֶר, Ex 29:33, Ex 29:36); cf. Pfleiderer, Paulinismus, p. 340ff (English translation 2:68f).
c. to purify internally by reformation of soul: Jn 17:17, Jn 17:19 (through knowledge of the truth, cf. Jn 8:32); 1 Thess 5:23; 1 Cor 1:2 (ἐν Χριστῷ Ἰησοῦ in the fellowship of Christ, the Holy One); Rom 15:16 (ἐν πνεύματι ἁγίῳ imbued with the Holy Spirit, the divine source of holiness); Jude 1:1 (L T Tr WH ἠγαπημένοις (which see)); Rev 22:11. In general, Christians are called ἡγιασμένοι (cf. Deut 33:3), as those who, freed from the impurity of wickedness, have been brought near to God by their faith and sanctity, Acts 20:32; Acts 26:18. In 1 Cor 7:14 ἁγιάζεσθαι is used in a peculiar sense of those who, although not Christians themselves, are yet, by marriage with a Christian, withdrawn from the contamination of heathen impiety and brought under the saving influence of the Holy Spirit displaying itself among Christians; cf. Neander at the passage.