출애굽기 12:19의 Responsa

Vinegar that has been mixed with the yeast of beer must be sold to a Gentile before Passover (in order not to violate the commandment of Ex. 12,19 and 13,7, which prohibits a Jew from possessing leaven during the Passover week). The Gentile may be told that if he holds the vinegar until after Passover, a Jew will buy it from him.
SOURCES: Cr. 68; Pr. 31; L. 340; Rashba I, 850.

Vinegar that has been mixed with the yeast of beer must be sold to a Gentile before Passover (in order not to violate the commandment of Ex. 12,19 and 13,7, which prohibits a Jew from possessing leaven during the Passover week). The Gentile may be told that if he holds the vinegar until after Passover, a Jew will buy it from him.
SOURCES: Cr. 68; Pr. 31; L. 340; Rashba I, 850.

They responded: the commandments around chametz were the first given to the children of Israel; they were accepted with love and warmth and joy, and they were guarded strictly down to the most minute details. You can see that the Torah was stringent to the level of prohibiting even seeing and owning it²Exodus 12:19 and Exodus 13:7 .. This is not the case for any other prohibition except for idolatry, where it is written "Do not bring an abhorrent thing into your house" (Deuteronomy 7:26). All who increase their meticulous observance shall have the days and years of their life increased too.

Vinegar that has been mixed with the yeast of beer must be sold to a Gentile before Passover (in order not to violate the commandment of Ex. 12,19 and 13,7, which prohibits a Jew from possessing leaven during the Passover week). The Gentile may be told that if he holds the vinegar until after Passover, a Jew will buy it from him.
SOURCES: Cr. 68; Pr. 31; L. 340; Rashba I, 850.