Reference for Shabbat 153:1
תנינא המוציא יין כדי מזיגת כוס ותני עלה כדי מזיגת כוס יפה וקתני סיפא ושאר כל המשקין ברביעית ורבא לטעמיה דאמר רבא כל חמרא דלא דרי על חד תלת מיא לאו חמרא הוא
learnt likewise: HE WHO CARRIES OUT [RAW] WINE, [THE STANDARD IS THAT THERE BE] ENOUGH FOR THE MIXING OF A CUP, whereon it was taught, Enough for the mixing of a full-measured cup; while the subsequent clause states; AND ALL OTHER LIQUIDS, [THE STANDARD IS] A REBI'ITH.<span class="x" onmousemove="('comment',' This shows that the lowest standard of potable liquids is a rebi'ith; hence the first clause must mean as much as is required for mixing to produce a cup of a rebi'ith. ');"><sup>1</sup></span> Now Raba is consistent with his view [expressed elsewhere]. For Raba said: Wine which does not carry three parts of water to one [of itself] is not wine. Abaye observed: There are two refutations to this. Firstly, because we learnt, And as for mixed [wine], that means two parts of water and one of wine, [namely] of Sharon wine.<span class="x" onmousemove="('comment',' Sharon is the plain along the Mediterranean coast from Japho to Carmel. Thus a proportion of two to one is stated here. ');"><sup>2</sup></span>