Reference for Bava Batra 255:1

אתה נתתו לי במתנה רצונך השבע וטול ונשבע אינו יכול לחזור בו

you gave him to me as a gift, [but] if you wish, take an oath<span class="x" onmousemove="('comment',' That he was neither sold nor presented. ');">¹</span> and you will get him back';<span class="x" onmousemove="('comment',' Though, legally, the possessor cannot be compelled to accept the oath of the claimant. ');">²</span>

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