Rev 15:1-8
1 And I saw another sign in heaven, great and marvellous, seven angels having the seven last plagues; for in them is filled up the wrath of God.
2 And I saw as it were a sea of glass mingled with fire: and them that had gotten the victory over the beast, and over his image, and over his mark, and over the number of his name, stand on the sea of glass, having the harps of God.
3 And they sing the song of Moses the servant of God, and the song of the Lamb, saying, Great and marvellous are thy works, Lord God Almighty; just and true are thy ways, thou King of saints.
4 Who shall not fear thee, O Lord, and glorify thy name? for thou only art holy: for all nations shall come and worship before thee; for thy judgments are made manifest.
5 And after that I looked, and, behold, the temple of the tabernacle of the testimony in heaven was opened:
6 And the seven angels came out of the temple, having the seven plagues, clothed in pure and white linen, and having their breasts girded with golden girdles.
7 And one of the four beasts gave unto the seven angels seven golden vials full of the wrath of God, who liveth for ever and ever.
8 And the temple was filled with smoke from the glory of God, and from his power; and no man was able to enter into the temple, till the seven plagues of the seven angels were fulfilled. (KJV)

From where is this "another sign" being shown to John?
"in heaven"

This which is spoken in Revelations 15 occurs in Heaven.

"And I saw as it were a sea of glass mingled with fire: and them that had gotten the victory over the beast, and over his image, and over his mark, and over the number of his name, stand on the sea of glass, having the harps of God."

Let us look at this from the Interlinear:
And I saw as it were a sea of glass mingled with fire and them that had gotten the victory over the beast and over his image and over the number of his name stand on the sea of glass having the harps of God.

Note that "and over his mark" is not written in the Greek manuscripts.

Who are these who had "gotten the victory over the beast and over his image and over the number of his name stand on the sea of glass having the harps of God."?

These are those goodly servants who have returned to Heaven, having already passed through this earth age, and died. They have already overcome, therefore have victory over death.


And, as we can see, these already knew the songs "And they sing the song of Moses the servant of God, and the song of the Lamb, saying, Great and marvellous are thy works, Lord God Almighty; just and true are thy ways, thou King of saints. Who shall not fear thee, O Lord, and glorify thy name? for thou only art holy: for all nations shall come and worship before thee; for thy judgments are made manifest."

As we looked at in one of the previous studies, "and no man could learn that song but the hundred and forty and four thousand, which were redeemed from the earth".

Rev 14:1-5
1 And I looked, and, lo, a Lamb stood on the mount Sion, and with him an hundred forty and four thousand, having his Father's name written in their foreheads.
2 And I heard a voice from heaven, as the voice of many waters, and as the voice of a great thunder: and I heard the voice of harpers harping with their harps:
3 And they sung as it were a new song before the throne, and before the four beasts, and the elders: and no man could learn that song but the hundred and forty and four thousand, which were redeemed from the earth.
4 These are they which were not defiled with women; for they are virgins. These are they which follow the Lamb whithersoever he goeth. These were redeemed from among men, being the firstfruits unto God and to the Lamb.
5 And in their mouth was found no guile: for they are without fault before the throne of God. (KJV)

Again, this speaks of 'learning'.
But, there are those who already had learned and knew the words of these songs, therefore they could sing them.

"And after that I looked, and, behold, the temple of the tabernacle of the testimony in heaven was opened:"

"the temple of the tabernacle of the testimony"
The Sanctuary (consisting of the 'HOLY PLACE' and the 'HOLY OF HOLIES') of the 'movable temple of YHVH' of the witness/evidence (divine).

As we have seen in Exodus and other books, the "tabernacle" was moved forward as the people moved forward.

The Sanctuary in Heaven is opened.

What or who comes forth from the Temple in Heaven?
"And the seven angels came out of the temple, having the seven plagues, clothed in pure and white linen, and having their breasts girded with golden girdles."


What are they given?
"And one of the four beasts gave unto the seven angels seven golden vials full of the wrath of God, who liveth for ever and ever."

These "vials" are yet to be poured out upon the earth.
They shall, as we looked at in a previous study, be poured out during the '5 months' of the Apostasy.

"And the temple was filled with smoke from the glory of God, and from his power; and no man was able to enter into the temple, till the seven plagues of the seven angels were fulfilled."

No man was able to enter the Sanctuary in Heaven until the "seven golden vials full of the wrath of God" have been poured out.

Is this the point when YHVH'S Two Witnesses shall shut Heaven?

Rev 11:6
6 These have power to shut heaven, that it rain not in the days of their
prophecy: and have power over waters to turn them to blood, and to smite
the earth with all plagues, as often as they will. (KJV)