Refutation: The text does not read "ha'Omdim be'Veis Hash-m ba'Leilos" ... (in the previous Kapitel [134])

Reason: Because then it ought to have mentioned "Yevarech'cha Hash-m mi'Tziyon", which is the Pasuk before "Halelukah", rather than the Pasuk which is three Pesukim earlier. That is why the correct text is the one that Tosfos prescribed.

Inference: In that case, we must say that "Halelukah, Halelu es Shem Hash-m", which precedes it ("she'Omdim be'Veis Hash-m ba'Leilos") is not the beginning of a paragraph

Reason #1: Since it would not be correct tor a Kapitel to consist only of two Pesukim (See Maharsha).

Reason #2: Moreover, the Medrash states that there are a hundred and forty-seven chapters in Tehilim, corresponding to the years of Ya'akov.

Conclusion: It must therefore be the end of "Shir ha'Ma'alos Hinei Borchu" (Kapitel 134).

Conclusion: This goes well with what Rav Acha bar Ya'akov says later - that one begins Halel ha'Gadol from "Ki Ya'akov Bachar lo Kah", which is now the beginning of the Kapitel ...

Reason: Because it is otherwise not conceivable that one would begin Hallel in the middle of a chapter.

Yetzi'as Mitzrayim in Kiddush: This explains why they inserted 'Zeicher li'Yetzi'as Mitzrayim' (in Kidush).

Proof: Tosfos heard from the Ram that there is a Medrash which states that the Egyptians subjugated Yisrael "be'Farech" (with rigor). And "Farech" in the Gematriyah of 'At Bash' equals 'VeGaL', which in turn adds up to thrity-nine, equivalent to the thirty-nine Malechos (that are forbidden on Shabbos).

Proof (cont.): And when Yisrael were redeemed from Egypt, Hash-m warned them about Shabbos - to desist from those thirty-nine Melachos.

Text: The text reads 'the fourth cup', not the fifth cup.

Refuted Ruling: And according to R. Yosef Tuv Ileim who wrote in his Hagadah that if one wants to add a little water, he may, if he is sick or finicky; and if h wishes to drink wine, then he should gird himself to do so over Hallel ha'Gadol'.

Refutation #1: One can ask, since it is forbidden to drink, why did they institute a fifth cup, since Chazal instituted four cups and not five?

Refutation #2: Also, why does he forbid drinking even water, which does not negate the taste of Matzah. We see that even after the Pesach, the Gemara later (on 119:), the Gemara only forbids food, but says nothing about beverages, even wine?

Implied Question: And when the Mishnah says that between the third and fourth cups one is not permitted to drink ...

Answer: The Yerushalmi establishes that with regard to not becoming inebriated, to the point that one is not able to recite Hallel.

Accepted Ruling: And Rabeinu Shmuel too Paskens later that all drinking is permitted.

Accepted Ruling #2: And even according to those Poskim who explain that attribute the prohibition of drinking between the third and fourth cups - to not negating the taste of Matzah, that refers to wine, but not to water ...

Proof: Similar to the prohibition against drinking between the first and second cups, which pertains exclusively to wine - 'so that it should bring on an appetite', as we learned above on Daf 108.).

Conclusion: Most people however, do drink, and also Rav Alfas permits water, forbidding only wine.