The following month more than fifty people, including many members or former members of Jessey's church, were rebaptised by immersion, in London. Barebone strongly disagreed with these advocates of believers' baptism, and within a few weeks he issued "A Discourse Tending to Prove the Baptism... to be the Ordinance of Jesus Christ". The claim that Barebone himself was an Anabaptist is likely to derive from post-Restoration critics. A second work, "A Reply to the Frivolous and Impertinent Answer of RB", was published in the spring of 1643. In the next few years Barebone was involved in conflicts with those who controlled the vestry of St. Dunstan-in-the-West, and with Francis Kemp, the lawyer who acted for them. Barebone later joined the sect known as the Fifth Monarchists, known for their millenarianism.