Lamb dipenjara untuk lebih dari 20 tahun (1955–57; 1958–78) karena penolakannya untuk bergabung dengan TPSM.<ref name=":1" /> Meskipun dipekerjakan untuk membersihkan toilet ember di pertanian kerja paksa atau pekerjaan yang melelahkan di tambang batu bara di [[kamp buruh]], Lamb terus mengajar.<ref>{{cite book|last=Anderson|first= Ken| year=1991|title= Bold as a Lamb: Pastor Samuel Lamb and the Underground Church of China|publisher= Zondervan|location=Grand Rapids, MI|pages=89–91}}</ref>
InPada tahun 1978, Lamb wasdibebaskan releaseddari frompenjara, prisondan and,pada intahun 1979,heia restartedmemulai thekembali churchgerejanya indi 35 Da Ma Zhan, Guangzhou. Because the attendance grew quickly, he then moved the meetings to 15 Rong Gui Li, De Zheng Bei Road. The house church is now known as Rongguili Church, under the name Damazhan Evangelical Church.<ref>{{Cite web|url=http://www.chinaaid.org/2018/10/police-block-access-to-decades-old.html|title=ChinaAid: Police block access to decades-old church|website=www.chinaaid.org|access-date=2018-11-18}}</ref> The house church continued to hold four main services each week, with an estimated attendance of four to five thousand,<ref name=":0" /> but was closed on October 14, 2018,<ref>{{Cite web|url=https://vom.com.au/china-another-prominent-house-church-shut-down/|title=Another prominent house church shut down|date=1 November 2018|website=Voice of the Martyrs|language=en|access-date=15 December 2018}}</ref> and a second time on December 15, 2018.<ref>{{Cite web|url=https://www.scmp.com/news/china/society/article/2178216/china-shuts-leading-underground-christian-church-third-winter|title=China shuts prominent Christian church, third this winter|last=Lau|first=Mimi|date=16 December 2018|website=South China Morning Post|language=en|access-date=18 December 2018}}</ref>
Mulai tahun 1979, Lamb menerbitkan sebuah seri buklet berjudul "Suara Roh" ({{Zh|c=|s=灵音小丛书|t=|p=Líng yīn xiǎo cóngshū}}, {{lang-en |Voice of the Spirit}}); now there are more than 200 booklets.{{cn|date=September 2023}}
