Тот, кто подозревает в отношении [соблюдения] Шеви'ита, автоматически не подозревается в отношении десятины. Тот, кто подозревает десятину, автоматически не подозревает Шев'ит . Тот, кто подозревает обоих, подозревает в чистоте. Есть тот, кто подозревает в чистоте, но не подозревает ни в одном из других. Правило состоит в том, что любой, кто подозревает что-либо в отношении чего-либо, не может судить или давать показания по этому поводу.
Tosefta Demai
One who sends fruits to his friend, and he [presumably the friend] decides to return it, he comports himself [vis-a-vis the returned fruit] according to how it was (i.e., its prior status). Abba Shaul says, "I would be concerned lest it be switched." Rabbi Shimon ben Gamaliel says, "If he has a sharecropper who knows how to tithe, but he (i.e., the landowner) does not trust him as to tithes, and he (i.e., the sharecropper) brought his fruits to him, and he said, yours (i.e., your share) are tithed, he is believed [in this instance]." Rebbi says, "He is not trustworthy [according to the principle] that one who is suspected regarding [one] matter may neither adjudicate nor testify" (Bekh. 30a:3).
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Tosefta Demai
An am ha'aretz who said, "This is untithed and this is Terumah," [or] "This is certainly untithed and this is Demai," even though they said that a suspect in a case can neither judge nor testify in [that case], we do not suspect a [fellow] Jew on such a thing [and he may be believed].