See, because LORD has given you the Sabbath, therefore he gives you on the sixth day the bread of two days. Abide ye every man in his place. Let no man go out of his place on the seventh day.

Remember the Sabbath day, to keep it holy.

Moreover I also gave them my Sabbaths, to be a sign between me and them, that they might know that I am LORD who sanctifies them.

Commandedst

These are the commandments, which LORD commanded Moses for the sons of Israel on mount Sinai.

Behold, I have taught you statutes and ordinances, even as LORD my God commanded me, that ye should do so in the midst of the land where ye go in to possess it.

But as for thee, stand thou here by me, and I will speak to thee all the commandment, and the statutes, and the ordinances, which thou shall teach them, that they may do them in the land which I give them to possess it.

Moses

Remember, I beseech thee, the word that thou commanded thy servant Moses, saying, If ye trespass, I will scatter you abroad among the peoples,

Because the law was given through Moses. Grace and truth came to be through Jesus Christ.

General references

And Moses said, Eat that today, for today is a Sabbath to LORD. Today ye shall not find it in the field.

and that ye may teach the sons of Israel all the statutes which LORD has spoken to them by Moses.

And he said to them, The Sabbath came into being for sake of man, and not man for sake of the Sabbath.