Reference for Menachot 31:4

שחט אחד מן הכבשים לאכול ממנו למחר הוא פיגול וחבירו כשר לאכול מחבירו למחר שניהם כשרים:

<big><b>GEMARA: </b></big>Rab said, The dispute<span class="x" onmousemove="('comment',' Between R. Meir and the Sages in our MISHNAH:');">⁵</span> is only where he offered<span class="x" onmousemove="('comment',' Lit., 'put it in' sc. the vessel, in readiness for the burning upon the altar. It must be remembered that the handful of flour was first burnt upon the altar and then the frankincense.');">⁶</span>

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