Shemot 31:14

14 Ye shall be shomer Shabbos therefore; for it is kodesh unto you; every one that is chillul Shabbos (desecrates Shabbos) shall surely be put to death; for whosoever doeth any work therein, that nefesh shall be cut off from among his people.

Shemot 31:14 In-Context

12 And Hashem spoke unto Moshe, saying,
13 Speak thou also unto the Bnei Yisroel, saying, Verily My Shabbatot ye shall be shomer over; for it is an ot (sign) between Me and you throughout your dorot; that ye may have da’as that I am Hashem Who doth set thee apart as kodesh.
14 Ye shall be shomer Shabbos therefore; for it is kodesh unto you; every one that is chillul Shabbos (desecrates Shabbos) shall surely be put to death; for whosoever doeth any work therein, that nefesh shall be cut off from among his people.
15 Sheshet yamim may work be done; but in the Yom HaShevi’i is Shabbos HaShabbaton, kodesh to Hashem; whosoever doeth any work in the Yom HaShabbos, he shall surely be put to death.
16 Wherefore the Bnei Yisroel shall be shomer Shabbos, to observe Shabbos throughout their dorot, for a brit olam.
The Orthodox Jewish Bible fourth edition, OJB. Copyright 2002,2003,2008,2010, 2011 by Artists for Israel International. All rights reserved.