סימן קיט סעיף ב
מְשָׁרְתוֹ אוֹ אֶחָד מִבְּנֵי בֵּיתוֹ, יִמְזְגוּ אֶת הַכּוֹסוֹת. וְכֵן בְּכָל פַּעַם שֶׁמּוֹזְגִין, יִמְזְגוּ הֵם וְלֹא הוּא בְּעַצְמוֹ, כְּדֵי לְהַרְאוֹת דֶּרֶךְ חֵרוּת. וְיַזְהִיר לִבְנֵי בֵיתוֹ, שֶׁיִּשְׁתּוּ מִכָּל כּוֹס לְכָל הַפָּחוֹת אֶת הָרֹב בְּפַעַם אַחַת, וּמִכּוֹס רְבִיעִי יִשְׁתּוּ רְבִיעִית בְּפַעַם אֶחָת. וִיכַוְּנוּ כֻּלָּם לְמִצְוֹת אַרְבַּע כּוֹסוֹת וְסִפּוּר יְצִיאַת מִצְרַיִם וַאֲכִילַת מַצָּה וּמָרוֹר, כִּי גַּם הַנָּשִׁים חַיָּבוֹת בְּמִצְוֹת אֵלּוּ, רַק בַּהֲסִבָּה אֵינָן נוֹהֲגוֹת. יַעֲשֶׂה קִדּוּשׁ כַּכָּתוּב בַּהַגָּדָה, וְיִשְׁתֶּה בַּהֲסִבַּת שְׂמֹאל. וְטוֹב אִם אֶפְשָר לַעֲשׂוֹת כְּדַעַת הַפּוֹסְקִים לִשְׁתּוֹת כּוֹס שָׁלֵם בְּכָל אַרְבַּעַת הַכּוֹסוֹת (תעב תעג תעט).
A servant or a member of the household should fill the cups, and each time the cups are filled, they should fill them, rather than doing it yourself. This conveys an impression of freedom. You should instruct the members of the household to drink at least the greater part of each cup at one time,5If the cup holds only a revi’is, you should, initially, drink the entire cup of wine. From a large cup, some Poskim say that it is sufficient to drink a revi’is, and others say you must drink the greater part of the cup, even though it holds several revi’is. Mishnah Berurah rules, according to the first opinion, but writes, nevertheless, that if you do not intend drinking a large quantity of wine, you should not use a large cup, but, rather, one that holds only a revi’is, in order to conform with the second opinion, as well. (Mishnah Berurah 472:30,33) and of the fourth cup, they should drink a revi'is at one time.6This means that the revi’is should be drunk in the time span of כְּדֵי אֲכִילַת פְּרַס. (kedei achilas peras) (Ibid. 472:34) See glossary. All should have in mind to fulfill the mitzvah of drinking the Four Cups (of wine), and of relating the story of the Exodus, and eating matzah and maror, because women, too, are required to perform these mitzvos, except that they do not recline. You recite the kiddush, as it is written in the Haggadah, and drink the wine while reclining on your left side. It is best, if possible, to follow the opinion of the authorities, and to drink the entire contents of all the Four Cups.
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.)