Related for Gittin 107:15
תא שמע המטביל כלים בשבת בשוגג ישתמש בהן במזיד לא ישתמש בהן הכי השתא התם גברא לטהורי מאני קא מיכוין אנן ליקום וליקנסיה
and the Sages holding that it is!<span class="x" onmousemove="('comment',' [This proves that R. Meir does not penalise the innocent for the presumptuous where the breach of a rabbinical law is concerned. Here the transgression involved is rabbinical, since according to the Torah he has discharged his liability by repaying the amount he had eaten. V. Yeb. 90a.] ');"><sup>14</sup></span>
Tosefta Terumot
One who eats pure terumah pays from pure chullin (unconsecrated produce). If he paid from impure chullin, what Summachos says is, [if] it is inadvertent, his payment is [valid] payment, [and if it is] intentional, his payment is not [valid] payment. But the Sages say, whether inadvertent or intentional, his payment [of impure produce] is [valid] payment, and [then] he goes back and pays [again] from the pure produce.
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