Matthew 3:2οὐρανῶν
and saying, “Repent, for the kingdom of heaven is near.”
Mark 1:10οὐρανοὺς
As soon as Jesus came up out of the water, He saw the heavens breaking open and the Spirit descending on Him like a dove.
Luke 2:15οὐρανὸν
When the angels had left them and gone into heaven, the shepherds said to one another, “Let us go to Bethlehem and see this thing that has happened, which the Lord has made known to us.”
John 1:32οὐρανοῦ
Then John testified, “I saw the Spirit descending from heaven like a dove and resting on Him.
Acts 1:10οὐρανὸν
They were looking intently into the sky as He was going, when suddenly two men dressed in white stood beside them.
Revelation 3:12οὐρανοῦ
The one who overcomes I will make a pillar in the temple of My God, and he will never again leave it. Upon him I will write the name of My God, and the name of the city of My God (the new Jerusalem that comes down out of heaven from My God), and My new name.

Abbott-Smith

οὐρανός, -οῦ, ὁ,
[in LXX chiefly for שָׁמַיִם (hence, often pl., οἱ οὐ., see infr.) ;]
heaven;

1. of the vault or firmament of heaven, the sky and the aerial regions above the earth: opposite to ἡ γῆ, Heb.1:10, 2Pe.3:5, 10; ὁ οὐ. καὶ ἡ γῆ, i.e. the world, the universe, Mat.5:18, Mrk.13:31, Luk.10:21, Act.4:24, Rev.10:6, al.; ἀπ᾽ ἄκρων οὐ. ἕως ἄ. αὐτῶν (on the absence of art. aft. prep., see Bl, §46, 5), Mat.24:31; ὑπὸ τὸν οὐ., Act.2:5, Col.1:23; ὑψωθῆναι ἕως τοῦ οὐ., figuratively, Mat.11:23, Luk.10:15; σημεῖον ἐκ τοῦ οὐ., Mat.16:1, Mrk.8:11, al.; αἱ νεφέλαι, Mat.24:30, al.; τὰ πετεινὰ τοῦ οὐ., Mat.6:26, Mrk.4:32, al.; οἱ ἀστέρες τοῦ οὐ., Rev.6:13, al.; pl. (οἱ) οὐ. (Bl., §32, 5), Mat.3:16, Mrk.1:10, Jhn.1:32, 2Pe.3:7, 13 al.

2. Of the abode of God and other blessed beings: of angels, Mat.24:36, Mrk.12:25, Gal.1:8, Rev.10:1, al.; of Christ glorified, Mrk.16:[19], Luk.24:51, Act.3:21, Rom.10:6, al.; of God, Mat.5:34, Rom.1:18, al.; ὁ Πατὴρ ὁ ἐν τοῖς οὐ. (Dalman, Words, 184ff.), Mat.5:16 6:1, al.; θησαυρὸς ἐν οὐ., Mat.6:20, Mrk.10:21, al.

3. By meton.,

(a) of the inhabitants of heaven: Rev.18:20

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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.