Matthew Poole and continuators on Revelation 15:5

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

Here is a plain Allusion to the Jewish Tabernacle or Temple, in which was the holy Place, and the Holy of Holies; into the latter the High-Priest only entred. There were kept in the Ark the two Tables of God's Law, often called the Testimonies of God. From this Tabernacle of Testimony proceeded God's Oracles; there God gave Answers from the Mercy-seat, and therefore in the Book of Kings it is called the Oracle. The Sense some put upon this, is, That God here shewed unto his Prophet the Liberty that should be, after the down-fall of Antichrist, to preach the Gospel. But in this sense it must be an Anticipation of what orderly should have come in after the pouring out of the Vials: I had rather understand it of God's being now about to give out an Answer to his Peoples Prayers for a Deliverance from the Tyranny of Antichrist; as the place called the Oracle in the Jewish Temple was opened when the High-Priest had been inquiring of God, to give an account of the Answer he had.

Marginal references: Chap. 11.19. Num. 1.50.