Reference for Shabbat 152:8
אמר רבא אף אנן נמי
A REBI'ITH. R. SIMEON SAID: [THE STANDARD FOR] ALL THESE IS A REBI'ITH, ALL THESE MEASURES HAVING BEEN STATED ONLY IN RESPECT OF THOSE WHO PUT THEM AWAY.<span class="x" onmousemove="('comment',' v. supra 75b, p. 359, n. 6. Here Rashi explains: These measures are less than a rebi'ith, and only one who actually put away that quantity and then carries it out is liable to a sin-offering. Tosaf. on 75b s.v. [H] accepts Rashi's explanation a.l. and rejects the present one. ');"><sup>15</sup></span> <b><i>GEMARA</i></b>. A Tanna taught: Enough for the mixing of a full-measured<span class="x" onmousemove="('comment',' Lit., 'fair'. ');"><sup>16</sup></span> cup. And what is a full-measured cup? The cup of benediction.<span class="x" onmousemove="('comment',' Grace after meals. It is sometimes recited over a cup of wine, which must be a full-measured rebi'ith, i.e., full to the very brim. ');"><sup>17</sup></span> R. Nahman said in Rabbah b. Abbuha's name: The cup of benediction must contain a quarter of a rebi'ith [of raw wine], so that it may be mixed and amount to a rebi'ith. Said Raba, We too
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