This is not an error of duplication. The full-fledged version of this Mitzvah are many and change for those who are learning the one/three chapter a day. The Message for the day from "Bringing Heaven Down to Earth" at the end of this Mitzvah is different than that of yesterday.

Positive Mitzvah 154: Resting on Shabbat
Exodus 23:12 "And on the seventh day you shall rest"

Look at a globe or a map and spot an island.

Do you see that bold brown patch of land amidst the surrounding blue water area?

It is clearly visible, existing peacefully and calmly, while the waves fling themselves against its sandy beaches.

The seventh day of the week - Shabbat - can be compared to an island.

Not a geographical one, but rather an "island in time."

The days before and the following week are busy and full of weekday activity. They are like those tossing waves in the sea. Shabbat is like that peaceful island.

We are commanded to stop all our work and rest on Shabbat.

On Shabbat, we do not concern nor involve ourselves in our weekday work and occupations.

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We take the laws of nature too seriously. We think of the world as though it exists just as its Creator exists.

A miracle is a state of enlightenment that says, "Our reality is nothing but a glimmer of a Higher Reality. In that Higher Truth, there is no world. There is nothing else but Him."

From: Bringing Heaven Down to Earth by Tzvi Freeman - tzvif@aol.com