Reference for Nedarim 69:2

אמר רב אחא בריה דרב איקא שניתנה לו על ידי אחר

it is permitted?<span class="x" onmousemove="('comment',' This contradicts Raba. ');">³</span> — Said R. Aha son of R. Ika: That is if it was given to him through another.<span class="x" onmousemove="('comment',' B gave it to C, who gave it to A. Since B voluntarily (in contradistinction to theft) let it out of his possession, his vow loses its validity. ');">⁴</span>

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