The Open Door (Temple Gate) Entrance Into Heaven

Is the door that the Apostle John saw open in Heaven the East Gate of the Heavenly Temple.

b. θύρα (G2374) is used of any opening like a door, an entrance, way or passage into:

Levitical Temple – Aaronic Priesthood

Then the glory of the LORD departed from off the threshold of the house (Temple), and stood over the cherubims. And the cherubims lifted up their wings, and mounted up from the earth in my sight: when they went out, the wheels also were beside them, and everyone stood at the door of the east gate of the LORD’s house; and the glory of the God of Israel was over them above. ~ Ezekiel 10:18-19

Levitical Temple – Zadok Priesthood

Thus says the Lord GOD; The gate of the inner court that looks toward the east shall be shut the six working days; but on the Sabbath it shall be opened, and in the day of the new moon it shall be opened. ~ Ezekiel 46:1

Melchizedek Heavenly Eternal Temple – Messiah (Christ) Priesthood

In the end of the [Saturday] Sabbath, as it began to dawn toward the first day of the week, came Mary Magdalene and the other Mary to see the tomb. And, behold, there was a great earthquake: for the angel of the Lord descended from heaven, and came and rolled back the stone from the door (θύρα – G2374), and sat upon it.~ Matthew 28:1-2

After this I looked, and, behold, a door (θύρα – G2374) was opened in heaven: and the first voice which I heard was as it were of a trumpet talking with me; which said, Come up here, and I will show you things which must be hereafter. ~ Revelation 4:1

Note: the Feast of Trumpets is a “New Moon” Feast.

Thayer’s Greek Lexicon
Lexicon :: Strong’s G2374 – thyra

γ. the door of the kingdom of heaven (likened to a palace) denotes the conditions which must be complied with in order to be received into the kingdom of God: Luke 13:24 (for Rec. πύλης); power of entering, access into, God’s eternal kingdom, Revelation 3:8 cf. Revelation 3:7 (but others besides; add here Revelation 4:1).

by David Anson Brown