"Remember" shows us......

Remember the sabbath day, to keep it holy. Six days shalt thou labor, and do all thy work: But the seventh day is the sabbath of the LORD thy God: 

Exodus 20:8-10

“The Sabbath was binding in Eden, and it has been in force ever since.
This fourth commandment begins with the word ‘remember’, showing that the Sabbath already existed when God wrote the law on the tables of stone at Sinai.
How can men claim that this one commandment has been done away with when they will admit that the other nine are still binding?”
D.L. Moody, Weighed and Wanting (Fleming H. Revell Co.: New York), 47, 48