Berakhot 98
"But Rab Huna has declared in the name of Rab : If one erred, he should say 'Blessed be He Who has given' [etc.] " ! He said to him, "Was it not reported in this connection : Rab Menashya b. Tahlifa said in the name of Rab: This teaching only applies if he has not commenced the benediction 'Who art kind and dealest kindly' ; but if he has commenced it, he must return to the beginning?"
Rab Iddi b. Abin said in the name of Rab 'Amram, in the name of Rab Nahman, in the name of Samuel: If one erred and omitted the reference to the New Moon in the Tefillah we make him repeat it: in the Grace after meals we do not make him repeat it.
Rab Abin asked Rab 'Amram, "Why is the Tefillah different from the Grace after meals in this respect?" He replied, "To me also that was a difficulty and I put the question to Rab Nahman, who told me, 'I have not heard the reason from the master, Samuel' ; but let us see : With regard to the Tefillah which is an obligation, we make him repeat it ; but with regard to the Grace after meals, where one can eat or not eat just as he pleases, we do not make him repeat it."
"But now, on the Sabbaths and Festivals, when there is no question of his not eating, then also, if he erred, he should repeat it !" He replied, "Quite so ; for Rab Shela said in the name of Rab : If he erred, he must recommence at the beginning." "But Rab Huna declared in the name of Rab : If one erred, he says 'Blessed be He Who has given'!" "Has it not been reported in that connection : 'This teaching only applies if he has not commenced the benediction "Who art kind and dealest kindly" ; but if he has started it, he recommences at the beginning'?"
That is to say, R. Meir considers it to be the size of an olive and R. Judah the size of an egg. But we have been told the reverse ; for there is a Mishnaic teaching : And so, he who went from Jerusalem and recalled that he had with him holy flesh , if he has passed Sofim, he burns it where he is ; but if not, he turns back and burns it before the Temple with some of the wood piled on the altar.
R. Johanan said: The statement must be reversed. Abbai said : There is certainly no necessity to reverse it ; for here they differ in the interpretation of Scripture : R. Meir holds, "And thou shalt eat" (Deut. viii. 10) — i.e. eating; "and thou shalt be satisfied" — i.e. drinking ; and "eating" means the minimum quantity of the size of an olive. R. Judah, on the other hand, holds, "And thou shalt eat and be satisfied" — i.e. eating wherein is some satisfaction; and what is that? That is the minimum quantity of the size of an egg.
But in the other case, they differ in reasoning; R. Meir holds that his return must be equal to his defilement — as his defilement is only possible by means of something of the minimum size of an egg, so must his return be necessitated by holy flesh of the minimum size of an egg. R. Judah, however, holds that his return must be equal to his prohibition — as his prohibition is with something of the minimum size of an olive, so must his return be necessitated by holy flesh of the minimum size of an olive.
With a hundred, one says "We will bless the Lord our God..."; with a hundred and himself, he says "Bless ye [the Lord our God]" etc. With a thousand, one says "We will bless the Lord our God, the God of Israel..." ; with a thousand and himself, he says "Bless ye...." With ten thousand, one says "We will bless the Lord our God, the God of Israel, the God of hosts, Who is enthroned above the Cherubim, for the food of which we have partaken" ; with ten thousand and himself, he says "Bless ye...." As he blesses, exactly so do they respond after him:
According to the numerical size of the assembly do they determine the form of the benediction; as it is said, "Bless ye God in full assemblies, even the Lord, ye that are from the fountain of Israel" (Ps. Ixviii. 27). R. 'Akiba said: What do we find in the Synagogue? Whether many or few, one says "Bless ye the Lord." R. Ishmael says : "Bless ye the Lord Who is to be blessed."