'Sabbath day' in the Bible

And if the peoples of the land bring wares or any grain on the Sabbath day to sell, that we would not buy from them on the Sabbath, or on a holy day. And that we would forego the seventh year, and the exaction of every debt.

Then I contended with the ranking men of Judah, and said to them, What evil thing is this that ye do, and profane the Sabbath day?

And I commanded the Levites that they should purify themselves, and that they should come and keep the gates, to sanctify the Sabbath day. Remember to me, O my God, this also, and spare me according to the greatness of thy loving k