Responsa for Nedarim 77:6
מאי פסקא אמר רבא (אמר) שמואל
Now this is well according to 'Ulla, who maintains that it means that the invalid's property is forbidden to the visitor, for he did not vow where it affects his own health.<span class="x" onmousemove="('comment',' Therefore, if his son fell sick, the visitor may not enter his house, because it is to be assumed that the question of his son's health did not come into consideration at the time of the vow. ');"><sup>11</sup></span> But on Samuel's explanation, that the visitor's property is forbidden to the invalid, what is the difference between himself and his son? — He can answer you: Our Mishnah means that the invalid may not benefit from the visitor; in the Baraitha, the case Is reversed. How state this definitely?<span class="x" onmousemove="('comment',' On what grounds is this difference based? ');"><sup>12</sup></span> — Said Raba:
Teshuvot Maharam
A. A gave the valuables to C in order that he deliver them to B should a certain condition not be fulfilled. Such a transaction is called asmakhta and is not binding since it was not made before an authoritative court. When A finally told C to deliver the valuables to B, he was acting under misapprehension that they were due him legally, as his statement indicates. His order, therefore, was not binding and B should return the valuables to A.
SOURCES: Cr. 290; L. 309; Mord. B. B. 324; Tesh. Maim to Kinyan, 3.