For the source text click/tap here: Nedarim 42
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During the Sabbatical year, the produce that grows is considered ownerless and is readily available to all.
The Mishna on our daf teaches that a person who makes a vow prior to the Sabbatical year that he will not derive benefit from his friend, cannot enter onto his property or eat fruit from his trees even if they are growing on branches that grow outside of his property.
During the Sabbatical year itself, however, even though he cannot enter his friend’s property, he would be allowed to eat fruit from the trees since the fruits are hefker – they are considered ownerless.
We struggle with the issue as to whether Shmittah is a divine or human declaration and modern iterations of the biblical law.