Reference for Menachot 33:21
ורבנן האי דאפקינהו רחמנא בלשון אכילה
A HALF-OLIVE'S BULK, THE OFFERING IS VALID, FOR EATING AND BURNING CANNOT BE RECKONED TOGETHER'<big><b>GEMARA:</b></big> R'Assi said in the name of R'Johanan, What is the reason for R'Eliezer s view? Because the verse reads, And if any of the flesh of the sacrifice of his peace-offerings be at all eaten.<span class="x" onmousemove="('comment',' Lev. VII, 18. Heb. lit., 'If eaten there shall be eaten'; hence the verse contemplates two kinds of eating.');"><sup>22</sup></span> The verse here speaks of two 'eatings'. the 'eating' by man and the 'eating' by the altar, to inform you that as there can be a wrongful intention concerning what is usually eaten by man, so there can be a wrongful intention concerning what is usually 'eaten' by the altar; and furthermore, as there can be a wrongful intention concerning what is usually eaten by man in regard to man's eating thereof<span class="x" onmousemove="('comment',' I.e., an intention expressed during the burning of the handful that what is usually eaten by man (sc. the remainder) shall be eaten by man beyond the time prescribed for the eating thereof. This intention renders the offering piggul. Similarly the intention that what is usually consumed by the altar shall be burnt upon the altar outside the prescribed time renders the offering piggul.');"><sup>23</sup></span> and concerning what is usually 'eaten' by the altar in regard to the altar's 'eating' thereof, so there can be a wrongful intention concerning what is usually eaten by man in regard to the altar's 'eating' thereof<span class="x" onmousemove="('comment',' I.e., the intention that what is usually eaten by man shall be burnt upon the altar outside the prescribed time also renders the offering piggul.');"><sup>24</sup></span> and concerning what is usually 'eaten' by the altar in regard to man's eating thereof. And why is this? Because the Divine Law expressed [the burning upon the altar] by the term 'eating'. And the Rabbis, [what would they say to this]? - The reason why the Divine Law expressed it by the term 'eating' was [to teach you]