For instance, a single grain of wheat produces three hundred ears of wheat each of which bears thirty grains, so that a single grain produces ten thousand grains, approximately. Can anyone fail to recognize that the force in the grain (or any created being), is insufficient to produce this amount?
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Dealing with Shemittah Non-Observance I
A person who does not observe Shemittah may not be given Shemittah-sanctified foods, out of concern that they will store these items beyond the biur deadline. However, he may be given small amounts of food, in the amount of less than three meals worth, for it may be assumed that these will be eaten in the immediate future. (Non-Jews, in contrast, may not be given any amount of Shemittah foods, which are Hashem’s gift to the Jewish People. A halachic authority should be consulted in regard to feeding Shemittah foods to non-Jews employed in one’s home.)
He may not be given any amount of demei Shevi’is monies, out of the very real concern that he will use them for purchases other than foods which must be eaten under conditions of Shemittah sanctity.
Dealing with Shemittah Non-Observance II
A Shemittah violator may similarly not be lent tools that will be used for farming, garden work, or for food preparation in large quantities in a way that the laws of Shemittah do not allow. However, they may be given something which has both permitted and forbidden use, as long as the person lending it does not know for certain that it will be used wrongly. The Chazon Ish stresses that one should in fact lend permitted things to these people, as part of the mitzvah of helping our fellow Jew.