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The Gemara cites Baraisas that discuss keeping children awake for the seder:
It was taught in a Baraisa: חייב אדם לשמח בניו ובני ביתו ברגל שנא' ושמחת בחגך – A man is obligated to gladden his children and the members of his household on Yom Tov, as is stated, “And you should rejoice on your festival [you, your son, your daughter, your slave, etc.]” במה משמחם ביין – With what does he gladden them? With wine. רבי יהודה אומר אנשים בראוי להם ונשים בראוי להן – Men with what is appropriate for them and women with what is appropriate for them. The Gemara explains that wine is appropriate to gladden men and Rav Yosef explains that new clothing is appropriate to gladden women. In Bavel, it was with colored garments and in Eretz Yisroel it was with white pressed linen garments. Rebbe Yehudah ben Beseirah says: בזמן שבית המקדש קיים אין שמחה אלא בבשר – When the Beis Hamikdash stands, [the mitzvah of] rejoicing is [fulfilled] only through [bringing an offering and eating its] meat. ועכשיו שאין בית המקדש קיים אין שמחה אלא ביין – But now that the Beis Hamikdash does not stand, [the mitzvah of] rejoicing is [fulfilled] only through [drinking] wine.
Rav Chisda defines the liquid measure of revi’is by describing the size of the space that a revi’is occupies: רביעית של תורה אצבעים על אצבעים ברום אצבעים וחצי אצבע וחומש אצבע – The revi’is of the Torah is two fingers by two fingers, with a height of two fingers, half a finger, and a fifth of a finger, or 2 x 2 x 2.7 fingers. Rav Chisda derives this from a Baraisa that teaches that, because a mikveh must be able to contain a person’s entire body at one time, it must be an amah by an amah, with a height of three amos, and the Chachamim determined that an area of that size contains forty se’ah. Applying the same ratio, Rav Chisda concluded that an area of 2 x 2 x 2.7 fingers contains a revi’is.
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