Sayyiduna Ali (may Allah be pleased with him) says that the Messenger of Allah (peace and blessings be upon him) ordered him to stand over the sacrificial camels and that "their meat, hides and saddle-cloths be distributed among the poor, and that nothing of them be given to the butcher as his wages."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 10242
Sayyiduna Ali (may Allah be pleased with him) said: the Messenger of Allah (peace and blessings be upon him) ordered me to take charge of his sacrificial camels, to give their meat, their hides and their saddle-cloths in charity, and not to give the butcher anything (from them). Then he said: "We will give him (his wage) from what we have."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 10243