Revelation 19:1

Here we enter upon a new scene. Babylon the great is fallen. The saints are here represented rejoicing over the woman which was drunk with the blood of the saints. (Chap. xvii. 6.) (Calmet) --- The voice of many multitudes....saying: Alleluia. In these visions, when the martyrs have triumphed and overcome persecutors, are sometimes represented their praises of God in heaven. Here in the Protestant translation, are retained Alleluia and Amen, which as St. Augustine takes notice, used not to be changed or translated in any language. (Witham)