Exodus 31:17 DBY

¹⁵  Six days shall work be done; but on the seventh day is the sabbath of rest, holy to Jehovah: whoever doeth work on the sabbath day shall certainly be put to death.

¹⁶  And the children of Israel shall keep the sabbath, to observe the sabbath throughout their generations -- [it is] an everlasting covenant.

¹⁷  It shall be a sign between me and the children of Israel for ever; for [in] six days Jehovah made the heavens and the earth, and on the seventh day he rested, and was refreshed.

¹⁸  And he gave to Moses, when he had ended speaking with him on mount Sinai, the two tables of testimony, tables of stone, written with the finger of God.