The Gemara asked where we can find a remez to the topic of Eiruv Tavshilin.
The Tanna [of the beraisa] brings it from here, Beraisa: “Whatever you have to bake, bake [before Shabbos], whatever you have to cook, cook [before Shabbos].” From this verse [it is superfluous, since one may not cook or bake on Shabbos, obviously everything must be prepared before Shabbos] Rabbi Eliezer derived that one may only cook [relying] on a cooked item, and bake [relying] on a baked item. Based on this, the Chachomim instituted Eiruv Tavshilin.
Beraisa: Once [on Yom Tov] Rabbi Eliezer regaled the people all day with hilchos Yom Tov, when the first group left, he said “they have big barrels of wine”. When the second group left, he said “they have kegs of wine”. When the third group left, he said “these have pitchers of wine”. When a fourth group left, he said “these have bottles of wine”. When a fifth group left, he said “they have cups”. When the sixth group got up to leave, he said “they have lack” [the word used can mean curse]. And he noticed that they were blanched, so he said, “My children, I have nothing against you. Only against those who left earlier, who forsook the everlasting life for pleasures of this world”. As they left he said to them the possuk in Nechemya “Go and eat delectable foods, and drink sweet wines. Send portions to those who are lacking. For this day is holy to our Master, do not be saddened, because the joy in Hashem will be your strength”. 
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