Revelation 19:1 (WEB)
After these things I heard something like a loud voice of a great multitude in heaven, saying, “Hallelujah! Salvation, power, and glory belong to our God;
Catechism · 2
In the Age of the Church
“The prophets and the saints, all those who were slain on earth for their witness to Jesus, the vast throng of those who, having come through the great tribulation, have gone before us into the Kingdom, all sing the praise and glory of him who sits on the throne, and of the Lamb.” — Catechism footnote: Cf. Rev 18:24; 19:1-8.
"From Thence He Will Come Agaln to Judge the Living and the Dead"
“The Church will enter the glory of the kingdom only through this final Passover, when she will follow her Lord in his death and Resurrection.” — Catechism footnote: Cf. Rev 19:1-9.