Related for Bekhorot 70:19
כמאן אזלא הא דאמר רב חסדא אמר רב קטינא
For if you will not say so, [but that an Israelite is suspected how according to the view of R'Meir<span class="x" onmousemove="('comment',' For R. Meir maintains that in a matter which one is suspected of disregarding, one is not believed even with reference to others, as according to R. Meir, even independent priests are not trustworthy (Rashi) .');"><sup>12</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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