Reference for Bava Kamma 57:15

אבל לאחר נפילה מאי דברי הכל פטור והא איכא ר"מ דמחייב אלא מאי דברי הכל חייב והא איכא רבנן דפטרי

maintains exemption.<span class="x" onmousemove="('comment',' For he holds that the liability in the case of Pit is only where the defendant had dug it in his own ground and though he subsequently abandoned it he retained the ownership of the pit itself; cf. supra p. 107; and infra 50a. ');">¹³</span>

Jastrow