1) Asceticism 1) Christian term 
• (n.) The tenets of Sabbatarians.
doctrine of those Christians who believe that Sunday (the Christian Sabbath) should be observed in accordance with the Fourth Commandment, which ...
Belief held by some Protestant Christians in the strict observance of the Sabbath, Sunday, following the fourth commandment of the Bible. It began in the 17th century. Sabbatarianism has taken...
Sab`ba·ta'ri·an·ism noun The tenets of Sabbatarians. Bp. Ward (1673). 
The rigid and scrupulous observance of the Sabbath as a divinely ordained day of rest. This view contends that people should abstain from all activity on the Sabbath, except for what is necessary for the benefit of society and is based on a strict understanding of Old Testament law (Reid et al. 1990