How does God command us to keep the Sabbath day?

Answer

"Remember the Sabbath day, to keep it holy." Ex. 20: 8.

By what is Grecia, the kingdom succeeding Medo-Persia, represented in the image?
In the interpretation of the vision, how is this self exaltation set forth?
What was the Lord's covenant which they were to keep as their part of this covenant?
What did some of the people do on the seventh day?
Is any of this kind of work to be done on the Sabbath?
Did they observe it after His resurrection?
How were their prayers answered?

Questions & Answers are from the book Bible Readings for the Home Circle