Rav Yehudah said, “The souring
wine that is sold in shops still retains the blessing over wine, that
is, “Who created the fruit of the vine.” Rav Zevid said, “Why should I
say a blessing over wine that has soured? Rather, the blessing is “Who
created everything by His word.” Rav Yehudah agrees about wine sold on
the corners, which the thirsty indiscriminate public consumes in haste,
that it is not wine at all.