Zevachim 12:5
Zevachim12: 5
פָּרִים הַנִּשְׂרָפִים וּשְׂעִירִים הַנִּשְׂרָפִים —
בִּזְמַן שֶׁהֵם נִשְׂרָפִין כְּמִצְוָתָן, נִשְׂרָפִין בְּבֵית הַדֶּשֶׁן, וּמְטַמְּאִין בְּגָדִים; וְאִם אֵינָן נִשְׂרָפִין כְּמִצְוָתָן, נִשְׂרָפִין בְּבֵית הַבִּירָה, וְאֵינָם מְטַמְּאִין בְּגָדִים.
The bulls that are burned and the hegoats that are burned — when they are burned according to their proper procedure, they are burned in the place of ashes, and they contaminate garments with tumah; but when they are not burned according to their proper procedure, they are burned in the palace precinct, and they do not contaminate garments with tumah.
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