Desecrates the Sabbath

Sabbath desecration is the failure to observe the Biblical Sabbath, and is usually considered a sin and a breach of a holy day in relation to either the Jewish Shabbat (Friday sunset to Saturday nightfall), the Sabbath in seventh-day churches, or to the Lord's Day (Sunday), which is recognized as the Christian Sabbath in first-day Sabbatarian denominations.

According to Mosaic Law, to desecrate shabbat intentionally, despite warning, is a capital offense (Exodus 31:15). All work was prohibited during shabbat, even minor tasks, such as "gathering wood" (Numbers 15:32-36). Since the decline of classical semicha (rabbinic ordination) in the 4th century C.E., the traditional Jewish view is that Jewish courts have lost the power to rule on criminal cases. As such, it would be practically impossible for Orthodox courts to enforce the death penalty in modern times, even if they had the political standing to do so. Talmudic protections for defendants make execution very difficult even by the Great Sanhedrin, e.g., requiring two competent witnesses to the shabbat violation, and an official court warning prior to the violation. Some Reform and Conservative rabbis condemn capital punishment generally, partly based on this stringency.

There are 39 categories of activity prohibited on Shabbat, derived in the tractate Shabbat (Talmud) from the construction of the Biblical tabernacle. Halakha (Jewish law) derives many further forbidden acts from these categories (toledoth and shevuth), with varying severity, that may not be performed except for preventing severe illness or death. Unwarranted violation of any of these precepts is termed chillul shabbat (profanation of shabbat). People who consistently violate shabbat today are generally not considered reliable in certain matters of Jewish law.

...
Wikipedia