nkjv Exodus:31:15-16
nkjv@Exodus:31:15 @ Work shall be done for six days, but the seventh is the Sabbath of rest, holy to the LORD. Whoever does any work on the Sabbath day, he shall surely be put to death.
nkjv@Exodus:31:16 @ Therefore the children of Israel shall keep the Sabbath, to observe the Sabbath throughout their generations as a perpetual covenant.