Darby had instituted a second meeting at Plymouth, and he complained of the Bristol Bethesda assembly in 1848, in which George Müller was prominent; he was concerned because they had accepted a member from Ebrington Street, Newton's original chapel. Bethesda investigated the individual but defended their decision, and Darby was not satisfied. He issued a circular on 26 August 1848, cutting off Bethesda and all assemblies who received anyone who went there. This defined the essential characteristic of "exclusivism" which he pursued for the rest of his life.