Zevachim8: 4
אֵבָרֵי חַטָּאת שֶׁנִּתְעָרְבוּ בְּאֵבָרֵי עוֹלָה — רַבִּי אֱלִיעֶזֶר אוֹמֵר: יִתֵּן לְמַעְלָן, וְרוֹאֶה אֲנִי אֶת בְּשַׂר הַחַטָּאת מִלְמַעְלָן כְּאִלּוּ הוּא עֵצִים. וַחֲכָמִים אוֹמְרִים: תְּעֻבַּר צוּרָתָן וְיֵצֵא לְבֵית הַשְּׂרֵפָה.
[If] the limbs of a chatas offering mixed with the limbs of an olah-offering — R’ Eliezer says: Let him place them atop [the Altar] and consider the chatas meat on top as if it were wood. But the Sages say: It must [be left] until its form becomes marred and [then] be taken out to the place of burning.