Halakhic (religious legal) devices to be able to maintain a modern agricultural and commercial system while giving heed to the biblical injunctions. Such devices represent examples of flexibility within the Halakhic system. Hillel the Elder, in the first century BCE, used the rule that remittance of debts applies only to debts between Jews, to develop a device known as prozbul in which the debt is transferred to a beth din. When owed to the court rather than to an individual, the debt survives the Sabbatical year. This device, formulated early in the era of Rabbinic Judaism when the Temple in Jerusalem was still standing, became a prototype of how Judaism was later to adapt to the destruction of the Second Temple and maintain a system based on biblical law under very different conditions. The rabbis of the Jerusalem Talmud created rules to impose order on the harvesting process including a rule limiting harvesters working on others' land to taking only enough to feed themselves and their families. They also devised a system, called otzar beit din, under which a rabbinical court supervised a communal harvesting process by hiring workers who harvested the fields, stored it in communal storage facilities, and distributed it to the community. There exists a major difference of opinion between two Acharonim, Joseph Karo and Moses ben Joseph di Trani, as to whether produce grown on land in Israel which is owned by non-Jews also has sanctity. According to Karo, such produce has no sanctity and may be used and/or discarded in the same way as any produce grown outside of Israel. According to di Trani, the fact that this produce was grown in Israel, even by non-Jews, gives it sanctity, and it must be treated in the special ways detailed above. Avrohom Yeshaya Karelitz, a noted Haredi halakhic authority who issued key rulings on Jewish agricultural law in the 1930s and 1940s, ruled like di Trani, holding that produce grown on land in Israel owned by non-Jews has sanctity. Karelitz's ruling was adopted first by the religious families of Bnei Brak and is popularly called Minhag Chazon Ish (the custom of the "Chazon Ish"). The rabbis of Jerusalem, on the other hand, embraced the opinion of Karo that produce farmed on land owned by non-Jews has no sanctity. This opinion is now called Minhag Yerushalayim "the custom of Jerusalem", and was adopted by many Haredi families,