The Rebbe's guidance on Pesach — its message, its preparations and its customs (IK = Igros Kodesh letter number):
True freedom. Pesach's freedom is both physical and spiritual: freedom from every limitation, inner and outer, to serve G-d with joy (IK 1476, 7252, 7257, 10371, 6805, 8400, 9306, 9883). Every day calls for its own "exodus" and growth (IK 6179, 7545, 9670), and one should seize the moment of spiritual opportunity without delay (IK 8614). True freedom includes freedom from worries and from the yetzer hara (IK 10746, 2062, 2064). Going beyond limitations (IK 6162). Pesach's inspiration should last all year (IK 2563, 7384, 2570).
The inner meaning. Pesach is the birth of the Jewish people in faith (IK 2591). Its dual lessons of individual and collective redemption (IK 8800), and its connection to spring and the rejection of nature worship (IK 8965, 10125, 994). On Nissan and counting the months from it (IK 10741); on the mouth ("peh sach") according to Rashbi and the Arizal (IK 7627); on Pesach, Shavuos and the leap year (IK 8982); on Pesach and Hakhel (IK 9305); on the Korban Pesach and Jewish education (IK 9878); on the Jewish people as a light to the nations (IK 10363). Pesach night is a time of revealed G-dliness and learning inner Torah (IK 8616). Purim and Pesach share an inner unity (IK 3388).
Matzah and faith. Eating matzah on Pesach strengthens faith so that it permeates one's whole life (IK 1501, 985). Distributing handmade shmurah matzah strengthens faith and Yiddishkeit, and brings blessing to the giver's family (IK 4177, 4183, 3413, 3412, 5343, 5346, 5375, 6832, 7275, 7317); send it with an explanation so recipients can fulfill the mitzvah (IK 10736). Baking matzah draws down blessing, spiritual and material (IK 2498); on the matzah campaign of Kfar Chabad, see IK 6161, 6191; on receiving matzah from the Rebbe's bakery, IK 2641; on terumos and maasros for shmurah matzah abroad, IK 2646. The mitzvah of eating matzah increases peace and unity (IK 7239).
Every child and every Jew. Pesach's core message is educating every Jewish child, whatever his background; no child should be left out of a seder (IK 1477, 5357, 2579, 4197). Give Maos Chittim so others can celebrate; freedom comes when we help others be free (IK 961, 3381, 3393, 967, 968, 991, 1108, 1513, 6815, 9664). Host guests at the seder (IK 7319), and help organize communal seders with shmurah matzah (IK 3444); a model seder for students (IK 3307). Use Pesach to spread Chassidus and draw others in (IK 2075, 2565, 5331, 8617), and give students material to share when they go home (IK 2541, 2573).
Preparing. In the last thirty days before Pesach, study its laws and its Chassidus (IK 4166, 9485). When moving home before Pesach, bring a siddur and Chitas in first (IK 3374). Celebrate Pesach with family rather than travel when possible (IK 3265, 10347), and stay with the community through the last days of Pesach (IK 6810); on a son returning home for Pesach, and on honoring parents and joining Acharon shel Pesach, see IK 2512, 6834. Between Purim and Pesach, overcome anxiety with emunah (IK 2580).
Customs and halachah. On selling chametz — the key is no longer given; mashkeh should not be included in the sale; the sale is worthwhile even where some might take from the chametz — see IK 4313, 8753, 7248. On a fifth cup at the seder, which contradicts established halachah, see IK 7961; on alternatives for the four cups and medicine for health reasons, see IK 7219; on Anash customs, see IK 7842. Seder customs and the Haggadah's structure (IK 383, 350, 3566); on Hallel and the two dishes, see IK 295; on eating chametz on Pesach and tashbisu, IK 8936; on the three groups who bring the Pesach offering, IK 8622; on the status of matzah and eruv, IK 3419; on an upsherin for a son born on Pesach, IK 2539.
See also: Tzedakah – Giving every day and at special times; Jewish outreach – Mitzvah campaigns; Shabbos and holidays – Sefirah, Pesach Sheni, Lag BaOmer and Shavuos.