Reference for Bava Metzia 64:19
תא שמע
But both 'and thou mayest forbear' and 'thou shalt surely help' refer to unloading! — Well [answer thus:] Who is the authority of this? R. Jose the Galilean, who maintained that [relieving the suffering of an animal is not Biblically [enjoined].<span class="x" onmousemove="('comment',' As may be seen from his view in the Mishnah; but Raba's dictum is based on the view of the Rabbis. ');"><sup>17</sup></span> Come and hear: If a friend requires unloading, and an enemy loading.<span class="x" onmousemove="('comment',' I.e., one meets two asses: one, belonging to a friend, is tottering under its burden, and help is needed to unload it; the other, belonging to an enemy, has fallen, and assistance is wanted to reload it. ');"><sup>18</sup></span> one's [first] obligation is towards his enemy, in order to subdue his evil inclinations.<span class="x" onmousemove="('comment',' Tosef. B.M. II. ');"><sup>19</sup></span> Now if you should think that [relieving the suffering of an animal is Biblically [enjoined], [surely] the other is preferable! — Even so, [the motive] 'in order to subdue his evil inclination' is more compelling.<span class="x" onmousemove="('comment',' Lit., 'better'. ');"><sup>20</sup></span> Come and hear: The enemy spoken of is an Israelite enemy, but not a heathen enemy.<span class="x" onmousemove="('comment',' Tosef. ibid. It is now assumed that this refers to Ex. XXIII, 5 ('him that hateth thee' = thine enemy). ');"><sup>21</sup></span> But if you say that [relieving] the suffering of an animal is Biblically [enjoined], what is the difference whether [the animal belongs to] an Israelite or a heathen enemy? — Do you think that this refers to 'enemy' mentioned in Scripture? It refers to 'enemy' spoken of in the Baraitha.<span class="x" onmousemove="('comment',' Quoted above: If a friend requires unloading, and an enemy loading etc. ');"><sup>22</sup></span> Come and hear: