Luke 1:15ἁγίου
for he will be great in the sight of the Lord. He shall never take wine or strong drink, and he will be filled with the Holy Spirit even from his mother’s womb.
Acts 1:2ἁγίου
until the day He was taken up to heaven, after giving instructions through the Holy Spirit to the apostles He had chosen.
Romans 1:2ἁγίαις
the gospel He promised beforehand through His prophets in the Holy Scriptures,
1 Corinthians 1:2ἁγίοις
To the church of God in Corinth, to those sanctified in Christ Jesus and called to be holy, together with all those everywhere who call on the name of our Lord Jesus Christ, their Lord and ours:
Ephesians 1:1ἁγίοις
Paul, an apostle of Christ Jesus by the will of God, To the saints in Ephesus, the faithful in Christ Jesus:
Revelation 3:7ἅγιος
To the angel of the church in Philadelphia write: These are the words of the One who is holy and true, who holds the key of David. What He opens no one can shut, and what He shuts no one can open.

Abbott-Smith

ἅγιος, -α, ον
(τό ἅγός, religious awe; ἅζω, to venerate), [in LXX chiefly for קֹ֫דֶשׁ ;]
primarily, dedicated to the gods, sacred (Hdt.; rare in Att., never in Hom., Hes. and Trag., who use ἁγνός), hence, holy, characteristic of God, separated to God, worthy of veneration.

1. Its highest application is to God himself, in his purity, majesty, and glory: Luk.1:49, Jhn.17:11, Rev.4:8. Hence

(a) of things and places which have a claim to reverence as sacred to God, e.g. the Temple: Mat.24:15, Heb.9:1;

(b) of persons employed by him, as angels: 1Th.3:13; prophets, Luk.1:70; apostles, Eph.3:5.

2. Applied to persons as separated to God's service:

(a) of Christ, Mrk.1:24, Jhn.6:69, Act.4:30;

(b) of Christians, Act.9:13, Rom.1:7, Heb.6:10, Rev.5:8.

3. In the moral sense of sharing God's purity: Mrk.6:20, Jhn.17:11, Act.3:14, Rev.3:7.

4. Of pure, clean sacrifices and offerings: 1Co.7:14, Eph.1:4.
SYN.: ἁγνός, pure, both in ceremonial and spiritual sense; ἱερός (sacer), sacred, that which is inviolable because of its (external) relation to God; ὅσιος (sanctus as opposite to nefas), that which is …

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Sources: Abbott-Smith’s Manual Greek Lexicon of the New Testament (1922, public domain) and glosses from STEPBible TBESG (CC BY 4.0); STEPBible TAGNT (Greek New Testament, CC BY 4.0); the Berean Standard Bible (public domain). Reformatted by Word Study, wording unchanged. All sources and licenses.