Reference for Menachot 187:10

<br><br><big><strong>הדרן עלך פרק שתי מידות</strong></big><br><br>

handed to him the head and the hind-leg, and he laid his hands on them and threw them [upon the altar fire]. The second priest handed to the first priest the two fore-legs, and he gave them to the High Priest who laid his hands on them and threw them.

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