פירוש על שמות 31:14

מות יומת SHALL SURELY BE PUT TO DEATH by the judges if there are witnesses testifying to the desecration and if the warning required by law had been given to the culprit immediately before he committed the offence.

ושמרתם את השבת, there is yet another reason why the Sabbath regulations must not be overridden for the sake of completing the Tabernacle sooner;

ושמרתם את השבת,"And you shall observe the Sabbath, etc." Why did G'd repeat the need to observe the Sabbath by adding a new rationale, namely that it was holy? Seeing that immediately before this verse the Torah had permitted violation of the Sabbath laws for the sake of sick people, we might have concluded that the holiness of the Sabbath is relative, i.e. that when compared to a sick person the Sabbath is merely secular. As a result people would violate the Sabbath to prepare medications, etc., even when the life of the patient was not in danger. The Torah therefore underlined the holiness of the Sabbath to warn us not to violate its statutes unless there was danger to a patient's life.