Exodus 31:14 YLT

¹²  And Jehovah speaketh unto Moses, saying,

¹³  'And thou, speak unto the sons of Israel, saying, Only, My sabbaths ye do keep, for it 'is' a sign between Me and you, to your generations, to know that I, Jehovah, am sanctifying you;

¹⁴  and ye have kept the sabbath, for it 'is' holy to you, he who is polluting it is certainly put to death -- for any who doeth work in it -- that person hath even been cut off from the midst of his people.

¹⁵  'Six days is work done, and in the seventh day 'is' a sabbath of holy rest to Jehovah; any who doeth work in the sabbath-day is certainly put to death,

¹⁶  and the sons of Israel have observed the sabbath; to keep the sabbath to their generations 'is' a covenant age-during,