Reference for Bava Kamma 198:12
התם בקראי פליגי
I was stating to you the view of R. Meir and you tell me the view of the Rabbis! Why did you not examine my words carefully wherein I said: "For he was a damage-doer [and] he was careless, and this should be considered as if the owner asked him to slaughter for him from one side<span class="x" onmousemove="('comment',' V. p. 580, n. 9. ');"><sup>20</sup></span> and he slaughtered for him from the other." For surely who reasons in this way if not R. Meir, who said that a human being has to take greater heed to himself?' But what [statement of] R. Meir [is referred to]? We can hardly say the one of R. Meir which we learned: (Mnemonic: <i>KLN</i>)<span class="x" onmousemove="('comment',' Keyword consisting of the Hebrew initial words of the three teachings that follow. ');"><sup>21</sup></span>