Related for Bekhorot 70:21
כמאן כר' יהושע בן קפוסאי
But surely with regard to a tithing animal [even the owner] is trustworthy, since if he wished he could have maimed the entire herd before tithing?<span class="x" onmousemove="('comment',' And this could have been done legitimately, as the animals were hullin. Therefore, why not believe him that he did not maim the animal?');"><sup>13</sup></span>
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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