Zevachim11: 1
דַּם חַטָּאת שֶׁנִּתַּז עַל הַבֶּגֶד, הֲרֵי זֶה טָעוּן כִּבּוּס. אַף עַל פִּי שֶׁאֵין הַכָּתוּב מְדַבֵּר אֶלָּא בַנֶּאֱכָלוֹת, שֶׁנֶּאֱמַר: ,,בְּמָקוֹם קָדֹשׁ תֵּאָכֵל“, אֶחָד הַנֶּאֱכֶלֶת וְאֶחָד הַפְּנִימִית טְעוּנוֹת כִּבּוּס, שֶׁנֶּאֱמַר: ,,תּוֹרַת הַחַטָּאת“ — תּוֹרָה אַחַת לְכָל הַחַטָּאוֹת.
[If] the blood of a chatas spattered on a cloth, it must be washed. Although Scripture speaks only about those [chatas-] offerings which are eaten, as it is said (Lev. 6:19): It shall be eaten in a holy place, both the [chatas offering which is] eaten and the inner [chatas offering] require washing, as it is said (Lev. 6:18): The law of the chatas — [there is] one law for all chatas-offerings.