Daf Yomi - Sukkah 45 - One more Day of Eating

Rashi in his second explanation of the Gemara learns that one who eats and drinks on the day after the festival is regarded as if he built a mizbeiach and offered a korban on it. The Shaar Yissachar explains that this procedure is in contrast to Motzai Shabbos where melaveh malkah is eaten at night and here we see that one eats and drinks following the festival. The reason for this distinction is because here the Gemara states that one who eats and drinks is deemed to have brought a sacrifice, which can only be offered during the day. Melaveh malkah, however, cannot be eaten on Sunday, because that would be similar to the gentiles who worship their deity on Sunday.