Rif Pesachim 19b {Pesachim 99b continues ... 101a}

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19b

{Pesachim 99b continues}
when he began before 9 hours and he extended his meal until the day became holy upon him {=it became Shabbat}, he spreads a cloth on the table {over the food}, makes kiddush, and then finishes his meal.

{Pesachim 100a}
For they learnt {in a brayta}: We interrupt {the meal} for Shabbat. These are the words of Rabbi Yehuda.
Rabbi Yossi says: We do not interrupt.
And there was an incident with Rabban Shimon ben Gamliel, Rabbi Yossi, and Rabbi Yehuda, who were eating in Acco, and the day became holy upon them.
Rabban Shimon ben Gamliel said to Rabbi Yossi: Do you wish for us to interrupt and thus give consideration to the words of our colleague Rabbi Yehuda?
He said to him: Every day you prefer my words to those of Rabbi Yehuda. Now, you wish to prefer Rabbi Yehuda's words in my very presence?! {Esther 7:8}:

ח וְהַמֶּלֶךְ שָׁב מִגִּנַּת הַבִּיתָן אֶל-בֵּית מִשְׁתֵּה הַיַּיִן, וְהָמָן נֹפֵל עַל-הַמִּטָּה אֲשֶׁר אֶסְתֵּר עָלֶיהָ, וַיֹּאמֶר הַמֶּלֶךְ, הֲגַם לִכְבּוֹשׁ אֶת-הַמַּלְכָּה עִמִּי בַּבָּיִת; הַדָּבָר, יָצָא מִפִּי הַמֶּלֶךְ, וּפְנֵי הָמָן, חָפוּ.

8 Then the king returned out of the palace garden into the place of the banquet of wine; and Haman was fallen upon the couch whereon Esther was. Then said the king: 'Will he even force the queen before me in the house?' As the word went out of the king's mouth, they covered Haman's face.

Let us not interrupt {the meal} lest the students see and establish the halacha like this for generations.
They said that they did not move from there until they established the halacha like Rabbi Yossi.

And Rav Yehuda cited Shmuel: The halacha is not like Rabbi Yehuda who said that he interrupts his meal, uproots the table, makes kiddush, and afterwards finishes his meal; and not like Rabbi Yossi who said that he first finishes his meal and then makes kiddush. Rather, he spreads a cloth {over the table} and then begins haMotzi and then finishes his sedua {Ran's girsa of the Rif: and then begins haMotzi and then blesses birkat haMazon}.

{Pesachim 100b}
There is a brayta in accordance with Shmuel: And they are in agreement that we do not bring the table {in the first place} unless he made kiddush, and if was brought, he spreads a cloth and makes kiddush.

And these words are regarding kiddush {on Friday night} but havdalah, he does not interrupt, as we will want to say later on. And this that Rav Tachlifa bar Avimi cited Shmuel, that just as we interrupt for kiddush, so do we interrupt for havdala -- that is to say that he spreads a cloth, makes havdala, and afterwards finishes his meal, just as he does by kiddush -- this is not so.

And those people who make kiddush in the synagogue -- Rav said: in terms of kiddush they have fulfilled {and so need not make kiddush again at home}, but in terms of wine they have not fulfilled {=borei peri hagafen - if they wish to go home and have more wine, they need to make a new bracha}.
And Shmuel said: {Pesachim 101a} Even kiddush they did not fulfill.

And according to Rav, why need he make kiddush in his home? In order to acquit his sons and members of his household {such that they have fulfilled their obligation}.
And according to Shmuel, why does he make kiddush in the synagogue? In order to acquit the duty of the guests, who eat and drink in the synagogue.