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Chapter 118:9
Preparations for the Seder

9. The [wine] cups (1) must all be whole, without any cracks or chips. They should be carefully washed and should be able to contain at least a "revi'is". (2)


(1) As we saw in HY 118:1, it is a mitzvah on the first night of Pesach to act and feel as if you, yourself, were just freed from slavery in Egypt. The Sages established the mitzvah of drinking four cups of wine during the seder, as an outward expression of this newfound freedom (Rambam, 'Yad', Chometz U'Matzah 7:7).

(2) A "revi'is" literally means "one quarter" because it is equal to the volume of one quarter of a "log." There is a dispute among the authorities as to what a revi'is equals in modern measurements. The opinions range from 88.7 ml to 150 ml (5.07 fluid ounces).

If the cup is capable of containing only a revi'is, one should preferably drink the entire cup of wine for each of the four cups. However, if one is unable to complete the cup, one can fulfill one's mitzvah by drinking most of the revi'is, a measure referred to as "maleh lugmav," which literally means a "cheek-full" (a quantity of liquid which fills one cheek of an average person).

If the cup is capable of holding more than a revi'is, the Ramban rules that one must drink most of the contents of the cup, whereas the Ran rules that it is sufficient to drink most of a revi'is. One should preferably conduct oneself in accordance with the Ramban, however, if one only drank most of a revi'is of a large cup (containing more than a revi'is), one has fulfilled his obligation ("Halachos of Pesach," by Rav Shimon Eider Vol II, pg 230 (Ch20 E1))

One should make sure to drink an entire revi'is for the fourth cup, because the "bracha acharona" ("after-blessing"), recited after the fourth cup, may only be recited after drinking a revi'is.

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