Negative Mitzvah 200: It is forbidden to allow any Chametz to be seen during Passover
Exodus 13:7 "And there shall be no leavened bread to be seen in your possession, neither shall leaven be seen within all your borders"

We are cautioned not to allow any Chametz to be seen in our possession on Pesach.

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Negative Mitzvah 201: It is forbidden to own Chametz during Passover
Exodus 12:19 "Seven days shall there be no leaven found in your houses"

We are forbidden to own any Chametz on Pesach.

Most people usually store all the Chametz foods, dishes and any other items which may be considered Chametz away and hidden from sight.

Then they go to the Rabbi and sign a note of sale.

The Rabbi sells the entire stock of Chametz to a non-Jew.

This enables us to keep this Mitzvah of not owning Chametz.

The non-Jew becomes the owner of all Chametz during Pesach, and then after Pesach the Rabbi buys back the Chametz from him so we can use it again.

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Positive Mitzvah 158: Eating Matzah on Passover
Exodus 12:18 "On that evening, you shall eat unleavened bread"

On the fifteenth night of the month of Nisan, the holiday of Pesach begins.

We commemorate the story of Pesach by eating the very same type of unleavened bread our ancestors ate as they made their exodus from Egypt.

We are obligated to eat the Matzot on the first night of Pesach.

On the other days of Pesach, we continue to eat Matzah because we may not eat any Chametz.

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Take-off of one of the Apollo missions was delayed due to a single, tiny loose component. From this the Rebbe learned:

The more momentous the mission, the more crucial the details. Including the most momentous mission of all, the purpose of Creation.

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