[quote="fisherman_carl, post:6, topic:266393"]
During the Jewish Passover meal the third cup is called "The Cup of Blessing." St Paul in 1 Cor 10:16 calls the Eucharistic cup," The Cup of Blessing.". Thus, the cup that Jesus blessed at the Last Supper would be the third cup. The first two cups were not mentioned presumably because the emphasis was on the third cup, when normally they would eat the lamb. But, instead of that, Jesus offers himself as the new Lamb who's flesh must be eaten.
The emphasis was on establishing a New Covenant through the Body and Blood of Jesus, offered as the Eucharist and sacrificed on the cross. Any Jew in the first century could reckognise the form of the Passover meal in the description of the Last Supper. Thus, not every detail would need to be spelled out. Instead the important factors were emphasized.
Actually, AFAIK the cups of wine really have no formal designations in Judaism. There is the Ashkenazic custom of filling the 'Cup of Elijah after the third cup (and the 'Cup of Miriam' that some also fill beside Elijah's at this point, just to be gender-equal ;)), but beyond this, the cups are just called, for lack of a better term, 'first cup' or 'second cup' and so on. Now a number of folks today (mostly Christians or Messianic Jews) may try to apply different names for each cup, but these are all unofficial, and the names could vary depending on the Seder.
With all due respect to Mr. Hahn, I think that the one flaw in his interpretation (which I once held actually) is the assumption that Passover meals during the Second Temple period were performed like modern Seders. On the contrary, it is more likely that the Passover meal - like many other aspects of Judaism - was not yet fully developed in Jesus' time and was yet still in a fluid, unfixed, evolving form. We can't just assume that the ritual stayed as it was after more than 2000 years; we must reconstruct, and it is difficult, if not impossible, to reconstruct exactly what happened in a 1st century Passover celebration.
We do know the basic structure and the basic elements of a Passover meal, but what I'm saying is that it is hard to reenact in detail what Jews two millenia would have specifically done. It's not like they had Haggadahs handy like today. :D I almost expect that every household or every community would have had their own 'flavor' of celebrating the feast, doing things as their fathers and their fathers before them have done. While rabbinic works such as the Mishna and the Talmud does purport to transmit the way many things were done in those days when the Temple still stood, we can't be too reliant on them and take them on face value as sources for Second Temple Judaism, since it seems that they often actually reflect more 'how we (the rabbis) would have wanted things done' than 'how things were done'. In short, more of an ideal fantasy than historical reality.