Reference for Bava Kamma 234:12
ונרדף ששיבר את הכלים של רודף פטור שלא יהא ממונו חביב עליו מגופו אבל של כל אדם חייב דאסור להציל עצמו בממון חבירו
The boat was in danger of sinking, so a certain person came along and pushed that man's ass over in to the river, where it drowned. When the case was brought before Rabbah<span class="x" onmousemove="('comment',' MS.M.: 'Raba'. ');"><sup>21</sup></span> he declared him exempt. Said Abaye to him: Was that person not rescuing himself by means of another man's money? — He, however, said to him: The owner of the ass was from the very beginning in the position of a pursuer.<span class="x" onmousemove="('comment',' I.e., of threatening to endanger human life, which involves even a capital liability during the continuance of the threat; v. Ex. XXII, I, and Sanh. VIII, 7 ');"><sup>22</sup></span>