Revelation 15:5

5 After this I looked, and I saw in heaven the temple—that is, the tabernacle of the covenant law—and it was opened.

Read Revelation 15:5 Using Other Translations

And after that I looked, and, behold, the temple of the tabernacle of the testimony in heaven was opened:
After this I looked, and the sanctuary of the tent of witness in heaven was opened,
Then I looked and saw that the Temple in heaven, God’s Tabernacle, was thrown wide open.