The Seventh Day Sanctified.*
Before Israel. Before Sinai. Before the Jewish people existed.
"And on the seventh day God ended His work which He had made; and He rested on the seventh day from all His work which He had made. And God blessed the seventh day, and sanctified it: because that in it He had rested from all His work which God created and made." Two days were named in Genesis 1, the first and the seventh. Only one was set apart. The Sabbath is not a Jewish ceremony. It is a creation ordinance, woven into time itself, given to all humanity through the first man.
* Isaiah 66:22-23, kept "from one Sabbath to another" in the new heavens and the new earth. The command outlives time itself.

