Reference for Berakhot 98:11

<big><strong>מתני׳</strong></big> כיצד מזמנין בשלשה אומר נברך בשלשה והוא אומר ברכו

MISHNAH How do we [say Grace] with Zimmun ? With three persons [at table], one says "We will bless [Him of Whose bounty we have partaken]" ; with three and himself, he says "Bless ye [Him of Whose bounty]" etc. With ten, one says

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