You are speaking of the oral law, the commandements of men, not the Law of Moses.
The commandments of men?
22 And so it was, on the sixth day, that they gathered twice as much bread, two omers for each one. And all the rulers of the congregation came and told Moses. 23 Then he said to them, “This is what the LORD has said: ‘Tomorrow is a Sabbath rest, a holy Sabbath to the LORD. Bake what you will bake today, and boil what you will boil; and lay up for yourselves all that remains, to be kept until morning.’ ” 24 So they laid it up till morning, as Moses commanded; and it did not stink, nor were there any worms in it. 25 Then Moses said, “Eat that today, for today is a Sabbath to the LORD; today you will not find it in the field. 26 Six days you shall gather it, but on the seventh day, the Sabbath, there will be none.”
27 Now it happened that some of the people went out on the seventh day to gather, but they found none. 28 And the LORD said to Moses, “How long do you refuse to keep My commandments and My laws? Exodus 16:22-28
This is the first time the Sabbath was mentioned in the bible.
The Sabbath was not mentioned in Genesis, nor did God instruct Adam about any Sabbath commandments.
Please show us where Jesus instructed His disciples to observe the Sabbath.