Related for Gittin 107:5
דרבי יהודה אדרבי יהודה לא קשיא באתריה דרבי יהודה חמירא להו שביעית
For [when] a certain man there called after another, 'You are a stranger<span class="x" onmousemove="('comment',' I.e., proselyte. ');"><sup>5</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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