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In page Excommunication:

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In such cases, the person involved is usually required to discuss the issues.[3] If they do not conform, the church ('meeting' or 'ecclesia') is recommended by the management committee ("Arranging Brethren") to vote on disfellowshipping the person. These procedures were formulated 1863 onwards by early Christadelphians,[citation needed] and then in 1883 codified by Robert Roberts in A Guide to the Formation and Conduct of Christadelphian Ecclesias (colloquially "The Ecclesial Guide").[4] However Christadelphians justify and apply their practice not only from this document but also from passages such as the exclusion in 1Co.5 and recovery in 2Co.2.[5]