פירוש על עבודה זרה 62:3

Yirmiyah notes that those in the town surely got there by the road—after all they were sent on their way from one place to another by the Jew. So how can we really be lenient with wine in the town?
Therefore, R. Yirmiyah offers an entirely different solution. The leniency that a simple closed cask is sufficient applies only to casks found near the wine presses. Since there are many people there, the Samaritan would be afraid to let the non-Jew touch the wine, lest the Jews see and refuse to buy from him. But elsewhere, where not that many people are around, Jews cannot drink Samaritan wine. Not because Samaritans libate, but because Samaritans do not observe the rabbinic stringencies surrounding the prohibition of non-Jews coming into contact with Jewish wine.