Reference for Pesachim 124:12
לשמו ושלא לשמו א"א לברר איסורו לאוכליו ושלא לאוכליו אפשר לברר איסורו
[When it is killed] for its own purpose and for another purpose, its disqualification is in [respect of] itself;<span class="x" onmousemove="('comment',' The illegitimate intention is in respect of the sacrifice itself.');"><sup>22</sup></span> [when he kills it] for those who can eat it and for those who cannot eat it, its disqualification is no [respect of] itself; [when it is] for its own purpose and for another purpose, it is impossible to distinguish i prohibition;<span class="x" onmousemove="('comment',' I.e., you cannot say this portion of the animal was sacrificed for its own purpose, and that portion for another purpose.');"><sup>23</sup></span> [when it is] for those who can eat it and for those who cannot eat it, it is possible to distinguish its interdict.<span class="x" onmousemove="('comment',' It is possible to allocate separately the share for those who cannot eat it.');"><sup>24</sup></span>