סימן קג סעיף ג
אֵיזֶהוּ עֹנֶג. זֶה שֶׁאָמְרוּ רַבּוֹתֵינוּ זִכְרוֹנָם לִבְרָכָה, שֶׁחַיָּב לֶאֱכוֹל בְּיוֹם טוֹב בְּכָל יוֹם שְׁתֵּי סְעוּדוֹת, אַחַת בַּלַּיְלָה וְאַחַת בַּיּוֹם. אֲבָל סְעוּדָּה שְׁלִישִׁית, אֵין נוֹהֲגִין בּוֹ. וְחַיָּב לְקַדֵּשׁ עַל הַיַּיִן קֹדֶם סְעוּדָּה וְיִבְצַע עַל שְׁתֵּי כִּכָּרוֹת שְׁלֵמוֹת כְּמוֹ בַּשַׁבָּת. וְיַרְבֶּה בְּבָשָׂר וְיַיִן וּמִגְדָּנוֹת כְּפִי יְכָלְתּוֹ (וְעַיֵּן לעיל ס' עב סע"ז ח).
What is meant by delight? As our Rabbis, of blessed memory, said on each Yom Tov day you must have two meals, one at night and one during the day,9If you did not eat at night, you must eat two meals during the day and say the night kiddush at the morning meal. (see Magein Avraham, Mishnah Berurah 529:13) but it is not our custom to have a third meal.10Some Acharonim hold it is best to eat at least some fruit. Some people add an extra dish in the morning meal to represent a third meal. However, this does not suffice for the third meal on Shabbos. (Mishnah Berurah 529:13) You are obligated to say kiddush over a cup of wine before the meal. You should say Hamotzi on two whole loaves as you do on Shabbos,11Shulchan Aruch 529: Because a double portion of manna was sent down on erev Yom Tov, as on erev Shabbos. (Beis Yosef, Rif) and you should be lavish with meat, wine and sweets, according to your means.
תנא דבי אליהו כל השונה הלכות בכל יום מובטח לו שהוא בן העולם הבא שנאמר הליכות עולם לו אל תקרי הליכות אלא הלכות (נדה ע"ג.)