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Before you can be a true brother or sister, in a spiritual way, you MUST both belong to The Congregation of God, which is a pillar and support of the TRUTH, 1Timothy 3:15. This congregation is the one that Jesus is the head of, Colossians 1:18, Ephesians 5:23-27. Everyone who belongs to this ONE congregation is a brother or sister, Matthew 23:8-12. Every True Christian considers himself RELATED to every other true Christian, Galatians 6:10, 1John 4:20.
The true Christian congregation all speak in agreement, and does not have divisions in it, 1Corinthians 1:10. True Christians should be honest in all things, Hebrews 13:18. If a person who claims to be a Christian, but is living a life that belies his claim, Christians should not fellowship with that one, not even eating with him or even greeting that one very friendly like, Titus 1:16, 2John 1:9-11, 2Thessalonians 3:9-12. If a person who is called a brother commits a serious sin and does not repent he must be removed from The Congregation, 1Corinthians 5:9-13. God's Congregation must be kept clean!!!
A vital point to remember; there is only ONE true Christian Congregation, ONE Faith, Ephesians 4:1-6. Of course The ONE Worldwide Congregation is made up of many small congregations, but are all ONE, because there are no divisions and all teach the same doctrines, because God only accepts TRUTH, John 4:23,24.