Apocalypse Explained # 432
432. Verse 5. Of the tribe of Judah twelve thousand sealed; of the tribe of Reuben twelve thousand sealed; of the tribe of Gad twelve thousand sealed.
5. "Of the tribe of Judah twelve thousand sealed," signifies love to the Lord, and that all who are in that love are in heaven, and come into heaven n. 433; "of the tribe of Reuben twelve thousand sealed," signifies the light of truth from that good, and that all who are in that light are in heaven and come into heaven n. 434; "of the tribe of Gad twelve thousand sealed," signifies the consequent good of life (n. 435, 436).
Arcana Coelestia # 1262
1262. From this it now becomes clear that 'the earth' here also means the Church; for when the earth is mentioned, one's only perception is of the nation or people there, and when a nation or people is envisaged one's only perception is of their character. Consequently 'the earth' means nothing other than the Church, as shown already in 662, 1066.