And after that I looked, and, behold, the temple of the tabernacle of the testimony in heaven was opened:
So Revelation 11:19: cf. Revelation 16:17. 'The tabernacle of the testimony' appropriately comes to view, where God's faithfulness in avenging His people with judgments on their foes is set forth. We need a glimpse within the Holy Place to "understand" (Daniel 10:14) the secret spring and the end of God's righteous dealings.
Behold. So Vulgate; but omitted by 'Aleph (') A B C, Syriac, Andreas.