Related for Bekhorot 70:15
רשב"ג אומר
According to which authority will be the ruling which R'Hisda reported in the name of R'Kattina, [who said]: An uncertain firstling<span class="x" onmousemove="('comment',' E.g., a ewe which gave birth to two males, the Mishnah (17a) stating that one belongs to the priest and the other remains in the possession of the Israelite as a doubtful firstling which is left to pasture until it is blemished and is then eaten.');"><sup>8</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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