If neither he nor anyone else made an Eiruv for him -

R. Yitzchak - they should roast for him a small fish.

Rav Chuna - they may even heat up water for him for Shabbos that follows Yom Tov.

Shmuel: They may light for him a candle.

Beraisa (R. Chiya): They may fill for him a barrel of water and light for him a candle.

There was once a man who vowed against accepting any type of labor from his son. He did this in order to provide his son with more time to learn Torah. The case was presented to R. Yosi ben Chalafta and he ruled that it is permitted for the son to fill a barrel of water and light a candle for his father (as these are not considered labor).

R. Chiya Rabbah went to his house. The people of his household told him that they had forgotten to make an Eiruv.

He asked them: Are there perhaps some lentils still remaining from before Yom Tov (that we can rely on as the Eiruv)?

They replied that they did have such a dish.

Question: Surely this shows that even one type of food suffices for an Eiruv (unlike R. Shimon ben Elazar's ruling)?

Answer: There were beets in the lentils (so there were two dishes).

Question: Surely this shows that there need not be a K'zayis of food in an Eiruv (as he asked if there are some lentils still remaining - implying even less than a K'zayis)?

Answer: There was a K'zayis of lentils (and when he said 'some', he was asking if a K'zayis of lentils remained).

Question: Surely this shows that before Yom Tov, one need not designate which food will be used?

Answer (Rav Chisda): Before Yom Tov, R. Chiya had the intention to use any cooked food that was in his home.

Beraisa (R. Shimon ben Elazar): Beis Shamai agrees with Beis Hillel that two dishes are needed.

They disagree over whether an egg spread on fish is considered to be two dishes. Beis Shamai say that it is only considered to be one dish (as the egg is attached to the fish); Beis Hillel say that it is two dishes.

All agree that if he crumbled a boiled egg into salted fish, he cut a leek into a fish, or he cooked two foods in the same pot, that they are all considered to be two dishes.

The Halachah follows R. Shimon ben Elazar (who was a student of the Tana Kama).

Rav: One cannot make an Eiruv with less than a K'zayis of food.

Question: Surely this disagrees with R. Yochanan who said that one may make an Eiruv that includes others who did not make an Eiruv (even though there is not enough for a K'zayis for each of the many people who might be included)? (We can therefore conclude that R. Yochanan does not require a K'zayis.)

Proof for R. Yochanan (Beraisa): R. Meir says - an Eiruv does not have a minimum quantity, neither when making it, nor in a situation where some of it was lost.

On Yom Tov that occurs on a Friday, one may not make an Eiruv Chatzeiros (to be able to carry on Shabbos), nor an Eiruv Techumin (to extend the distance outside of the city that he may walk) - as both of these look as if he is fixing on Yom Tov.

Chachamim: One may make an Eiruv Chatzeiros but not an Eiruv Techumin - he may make an Eiruv Chatzeiros because you are permitting to him something that is permitted for him today (on Yom Tov). He may not make an Eiruv Techumin because you are permitting to him something that is prohibited for him today (as there is also prohibition of Techum on Yom Tov).

There is a Beraisa that reverses the opinions of the Chachamim with R. Meir.

R. Elazar: Since the Beraisa reverses the opinions, we must be concerned and even prohibit Eiruv Chatzeiros.

R. Yirmiyah quoting R. Zeira: One who wishes to behave correctly will also make his Eiruv Chatzeiros before Yom Tov.

R. Yudan: This applies only when he did not make an Eiruv Tavshilin, but if he did, it is permitted.

Question (R. Yosa bei R. Bun against R. Yudan): Can an Eiruv Tavshilin be considered to be walls to permit carrying on Yom Tov?!