Exodus 31:12 says, And the LORD spake unto Moses, saying,  Moses always recognized when God spoke to him, and so must we.  We cannot just assume that we know what God wants without first listening to what God has to say.  Verse thirteen states, Speak thou also unto the children of Israel, saying, Verily my sabbaths ye shall keep: for it is a sign between me and you throughout your generations; that ye may know that I am the LORD that doth sanctify you.  God again told Moses to tell the people of Israel to keep the sabbath.  It was a sign between God and them and was to kept forever.  As stated before, we today observe the Lord's Day, or Sunday, as our sabbath, but it should still be kept holy to God.  This is our day to rest and worship God.  Verse fourteen adds, Ye shall keep the sabbath therefore; for it is holy unto you: every one that defileth it shall surely be put to death: for whosoever doeth any work therein, that soul shall be cut off from among his people.  Not keeping the sabbath brought a death penalty.  We might have a lot fewer people who profess to be Christians today if everyone of them who does not keep the sabbath, or the Lord's Day, holy were put to death.  Verse fifteen continues, Six days may work be done; but in the seventh is the sabbath of rest, holy to the LORD: whosoever doeth any work in the sabbath day, he shall surely be put to death.  God again told Moses that the people of Israel were to work six days a week then rest to keep the sabbath holy.  We only work five days a week normally, and still too often fail to keep the Lord's Day, our sabbath, holy  Verse sixteen states, Wherefore the children of Israel shall keep the sabbath, to observe the sabbath throughout their generations, for a perpetual covenant.  Since God put so much emphasis on keeping the sabbath perpetually, I believe that we can say that it was and is important to do so.  Verse seventeen declares, It is a sign between me and the children of Israel for ever: for in six days the LORD made heaven and earth, and on the seventh day he rested, and was refreshed.  This was to be a sign between the people and Israel and God.  The sabbath would have no meaning to those who were not God's people, just as the Lord's Day has no meaning to those who are not followers of Christ today.  Verse eighteen adds, And he gave unto Moses, when he had made an end of communing with him upon mount Sinai, two tables of testimony, tables of stone, written with the finger of God.  These were the Ten Commandments, written by God's finger.  Again, these were not Moses commandments that he thought up, but the commandments of God.  They are till His commandments today.