This chapter explains a disputation on the Sabbath and the Lord's Day in the bilingual edition of the Synopsis Purioris Theologiae . In the first place, as far as the verb Shabbat is concerned, it has the same force of meaning as 'to cease', 'to be at rest', 'to stop'. The special aspect of the Sabbath, insofar as God's ordinance has reduced the general aspect to this special one, is "the seventh day after creation" or the Sabbath, and even the one "commanded to the Jews". One deems that the Lord's Day should be spent in the holy duties of piety not only in public but also privately. But one rejects entirely those who overturn the Lord's Day under the pretext of Christian liberty, such as the Anabaptists of today. Keywords: Anabaptists; Jews; Lord's Day; piety; Sabbath; seventh day; the Synopsis Purioris Theologiae