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Since the major use of wood is as firewood, it does not have kedushas shvi’is.
Summary
This is a matter of debate between the Tannaim, as we learn in a beraisa:* Fruit of shvi’is cannot be used to soak flax, or for laundering. Rabbi Yosi: It may be used for these purposes.
The Tanna Kamma bases his opinion on the word “For eating”: these fruits may not be used for any other purpose. Rabbi Yosi bases his opinion on the word “For yourself”: so the fruits may be used for any purpose.
The Tanna Kamma explains the word “For yourself”: that all uses “for yourself” have to be similar to “For eating”- in that it is enjoyed as it is destroyed (32.1).
Rabbi Yosi explains the word “For eating”, that it cannot be used for medicinal purposes [which is only necessary for a minority of people]. This is further explained in a beraisa brought by the gemara.
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