How do we perform zimmun? When there are three, he says: ‘‘Let us bless.’’ When there are three besides him, he says: ‘‘Bless.’’ When there are ten, he says: ‘‘Let us bless our God.’’ When there are ten besides him, he says: ‘‘Bless.’’ [It is all] one [formula] whether there are ten or ten myriads. When there are a hundred, he says: ‘‘Let us bless Hashem, our God.’’ When there are a hundred besides him, he says: ‘‘Bless.’’ When there are a thousand he says: ‘‘Let us bless Hashem our God, the God of Israel.’’ When there are a thousand besides him, he says: ‘‘Bless.’’ When there are ten thousand, he says: ‘‘Let us bless Hashem our God, the God of Israel, the Lord of Hosts, Who dwells by the Cherubim, for the food that we have eaten.’’ When there are ten thousand besides himself, he says: ‘‘Bless.’’ In the same manner in which he makes the blessing so do they respond after him: ‘‘Blessed is Hashem our God, the God of Israel, the Lord of Hosts, Who dwells by the Cherubim, for the food we have eaten.’’ R’ Yose HaGlili says: They recite the blessing in accordance with the size of the assemblage as it is stated (Psalms 68:27): ‘‘In assemblages, bless God, Hashem, from the source of Israel.’’ R’ Akiva says: What do we find in the synagogue? Whether many or few, he says: ‘‘Bless Hashem.’’ R’ Yishmael says: ‘‘Bless Hashem, the blessed One.’’