Reference for Bava Batra 90:1

המפקיד אצל חבירו בעדים אינו צריך להחזיר לו בעדים לא ס"ד אלא המפקיד אצל חבירו בעדים צריך להחזיר לו בעדים

that if a man entrusts an article to another in the presence of witnesses, the latter need not return it in the presence of witnesses?<span class="x" onmousemove="('comment',' Because only on this supposition would his plea that he has bought it be valid, this plea itself being only a modified form of the plea 'I returned it to you'. ');">¹</span>

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