Midrasch zu Jechezkiel 34:19

Rabbi Elazar of Modein said: Phineas arose, and pronounced the ban upon Israel by the mystery of the Ineffable Name, and with the script which was written on the tables (of the Law), and by the ban of the celestial Court of Justice, and by the ban of the terrestrial Court of Justice, that a man of Israel should not drink the wine of the nations unless it had been trodden by the feet, as it is said, "And as for my sheep, that which ye have trodden with your feet they eat, and they drink that which ye have fouled with your feet" (Ezek. 34:19). Because all the wine of the nations was devoted to idolatry and immorality, for they took the first of their new wine for idolatry and immorality, as it is said, "Whoredom and wine || and new wine take away the heart" (Hos. 4:11).