Pesachim7: 5
נִטְמָא הַבָּשָׂר וְהַחֵלֶב קַיָּם — אֵינוֹ זוֹרֵק אֶת הַדָּם. נִטְמָא הַחֵלֶב וְהַבָּשָׂר קַיָּם — זוֹרֵק אֶת הַדָּם.   וּבַמֻּקְדָּשִׁין אֵינוֹ כֵן, אֶלָּא אַף עַל פִּי שֶׁנִּטְמָא הַבָּשָׂר וְהַחֵלֶב קַיָּם — זוֹרֵק אֶת הַדָּם.
[If] the flesh [of the pesach-offering] became contaminated but the fat remained [uncontaminated], one may not throw the blood. [If] the fat became contaminated but the flesh remained [uncontaminated] he throws the blood. But in the case of [other] consecrated animals it is not so. Rather, even when the flesh became contaminated and the fat remained [uncontaminated] he throws the blood.