Not so much it's children; found in Revelation chapters 2-3.
Jesus' Kingdom, the Kingdom of God, is not of this world, to us invisible, but not to God, or the angels (bad or good), the friends of the Bride, and the regenerated saints alone who have passed into Glory and the presence of the Prince; the panegyric festive assembly which is the church gathering in heaven whose Head is the First-begotten from the Dead, and whose members are written in the Lamb's Book of Life: That is the invisible church of saved souls only, not of others who may even be hoping for it, but not throughly and wholly committed to the Messiah by faith alone, through God's grace alone, made accepted in The Beloved. No "church" on earth is of that class, although it may have constituents who are the possession of The Lord.