The sabbath was first introduced in the Bible in the book of Genesis, in which was the story of creation of the world is found. God created the world in six days. God finished the world on the sixth day. He blessed the seventh day for rest.
The Ten Commandments are the cornestone of Jewish religion. The fourth commandment says, "Remember the Sabbath is holy. Six days you shall labor, but the seventh is the Sabbath. You shall not work on the Sabbath." The commandment meant something to the world. It meant a weekly day of rest. From the beginning of time there was work. Moses led the Jews out of Egypt onto Mt. Sinia where God gave the Ten Commandments to Moses, which the fouth commandment came from.
For centuries the sabbath has been a holy day. The shofar signaled the Sabbath. At the first bolw, all the farmers went home. At the second blow, all the shops closed. At the third blow, the Sabbath candals were lit, and the last three blows welcomed the Sabbath Day.