For the source text click/tap here: Pesachim 105
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As we have learned before, if someone is eating a meal on Friday and the meal extends into Shabbat, we do not need to end the meal entirely; rather we can cover the bread and make Kiddush. Our Gemara discusses the case of someone who is eating the third Shabbat meal and it extends after Shabbat is over.
To clarify these halakhot, the Gemara tells a story about such cases and the behavior of the Sages when faced with these circumstances. Rav Nachman bar Yitzchak was asked what the difference is between Kiddush and Havdalah. Havdalah is supposed to be delayed and not recited immediately at the conclusion of Shabbos, even though that is its proper time.
Rav Nachman bar Yitzchak answered,
"I am not a Chacham, I am not a Chozeh, I am not a Yachid. I am a Gamar and a Sadar, and they say in the Beis Midrash the same thing that I say, that there is a difference between the onset of the day (Kiddush) and the conclusion of the day (Havdalah). When it comes to Kiddush, the sooner we recite it, the better, for we show how beloved it is to us. When it comes to Havdalah, the more we delay it, the better, in order not to make it appear like a burden upon us.”
We learn of his mother who consulted an astrologer before he was born....We are told in the Talmud that an astrologer once told her that her son would grow up to be a thief....see what happened then...