Rif Brachot 42a

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42a

{Chullin 107a continues}
and if you would place it into a bucket, such that it would come from human force, we may use it to wash hands.
And if the bucket has a hole in it such that you can pour liquid into it, (we may not use it to wash your hands, for it is not a vessel. And Rabba said:) a vessel which does not have in it a reviit, we do not wash hands with it.

Rav Ashi said to Amemar: Are we insistent upon the vessel; are we insistent upon the appearance; are insistent upon the measure?
He said to him: Yes.

There are some that say: upon the vessel and the appearance we are insistent; upon the measure we are not insistent, for we learn {tnan}:
Water which is a reviit, we wash the hands of one, and even two.

It is different over there, for it comes from the remains of purity {in that it started with the requisite measure}.

Rav Yaakov from Nehar Pekod created a natla {a glass cup used to measure out a reviit} that measured a reviit.

And Rava said: a flask cover that were fixed {by carving into it a hold capable of holding a reviit} we may use to wash hands. A cheimet {Jastrow: goat-skin bottle} and kefisha {Jastrow: inverted vessel, usually divided into two compartments by the bottom between} {Rashi: two types of leather flasks} we may use to wash hands.

A sack and a basket even if they were fixed it up {to hold some water}, we may not use to wash hands.

It was a question to them: may one eat using a napkin {to cover hands, rather than washing them}? Do we make a decree lest one accidentally come to touch the bread, or not.

{Chullin 107b}
And the conclusion: Rav Tachlifa bar Avdimi cited Shmuel: They permitted with a napkin for eaters of teruma {for they are Kohanim and are zerizim} and they did not permit to those who eat taharot {the better girsa, in Rashi: to those who eat chullin in purity}.

It was a question to them: the one who consumes through one who feeds, does he need wash his hands of not? {that is, someone feeds his friend, such that the friend is not touching the food - need he wash his hands?}

And we conclude - and the halacha is, the one who consumed through one who feeds, needs to wash his hands, and the feeder himself does not need to wash his hands.

Rav Yehuda cited Rav: One should not give a piece to the attendant {waiter} unless he knows that he {the attendant} has washed his hands. And the attendant blesses on every single cup {because he is not sure he will get another one} but does not bless on every single piece.

Rabbi Yochanan said: he even blesses on every single piece.

And they do not argue. Here is where there is a prominent man {at the meal, so the attendant may be sure he will get all he needs}; here is where there is not a prominent man.

The Sages learnt {in a brayta}: one should not give a piece to the attendant