(Gen 2:1) And the heavens and the earth were finished, and all their host. (Gen 2:2) And on the seventh day Elohim completed His work which He had made. And He rested on the seventh
(Gen 2:1) And the heavens and the earth were finished, and all their host. (Gen 2:2) And on the seventh day Elohim completed His work which He had made. And He rested on the seventh day from all His work which He had made. (Gen 2:3) And Elohim blessed the seventh day and sanctified it, because He rested from all His work on it, which Elohim had created to make.
While the word Sabbath does not appear in the English text, it appears in the original Hebrew twice, where it is translated "he rested". The idea of rest in the Hebrew word shabbath is a late one, and dependent on the concept of the Sabbath day rather than the other way around. The original, earlier meaning of the word is to cease, as in Genesis 8:29. The textual use of the word suggests that it also means "to sabbatize" or "to celebrate Sabbath".
A candid reading of the Hebrew Bible makes it very clear that the Sabbath goes back to creation, whether or not that is clear in the biased translations that we have. But the first mention of the Sabbath in the KJV is still before the giving of the law on Mount Sinai. Therefore, the claim that the Sabbath was first given in the Sinai covenant with the Jews falls flat in any case.
The Sabbath and the Manna
(Exo16:23) And he said unto them, This is that which Yahuwah hath said, To morrow is the rest of the holy Sabbath unto Yahuwah: bake that which ye will bake to day, and see the that ye will seethe; and that which remaineth over lay up for you to be kept until the morning. (Exo 16:24) And they laid it up till the morning, as Moses bade: and it did not stink, neither was