Is it permissible to sell any part of the sacrificial animal, whether meat or skin?

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It is not permissible to sell any part of the sacrificial animal, whether meat or skin, regardless of whether it was obligatory or voluntary, because it has been specifically designated (ta'ayyana) by the act of slaughter. Imam Ahmad prohibited selling it or any part of it, questioning how one could sell what has been designated for Allah (SWT). This prohibition is based on the command to divide the skins and the prohibition against giving any part to the butcher. Since it is designated for Allah (SWT), it cannot be sold, similar to a Waqf (endowment).