Hadith: The Messenger of Allah (may Allah's peace and blessings be upon him) put me in charge of slaughtering his camels (which he wanted to sacrifice); and to give in charity their meat, skins, and saddle cloths; and not to give any of them to the butcher

عن علي بن أبي طالب رضي الله عنه قال: «أَمَرَنِي رَسُول اللَّهِ -صلَّى الله عليه وسلَّم- أَن أَقُومَ عَلَى بُدْنِهِ، وَأَن أَتَصَدَّقَ بِلَحمِهَا وَجُلُودِهَا وَأَجِلَّتِهَا، وَأَن لا أُعْطِيَ الجَزَّارَ مِنهَا شَيْئًا».
[صحيح] - [متفق عليه]

‘Ali ibn Abi Tālib (may Allah be pleased with him) reported: The Messenger of Allah (may Allah's peace and blessings be upon him) put me in charge of slaughtering his camels (which he wanted to sacrifice); and to give in charity their meat, skins, and saddle cloths; and not to give any of them to the butcher.
[Authentic hadith] - [Narrated by Bukhari & Muslim]

Explanation

The Prophet (may Allah's peace and blessings be upon him) went to Makkah during the Farewell Hajj and he Hady (sacrifice). ‘Ali ibn Abi Tālib (may Allah be pleased with him) came from Yemen and also had a Hady. Since the Hady is a charity for the poor and needy, the giver has no right to freely use it or any of its part for exchange, as the Prophet (may Allah's peace and blessings be upon him) forbade ‘Ali from giving the butcher any of it in exchange for his work. Instead, he would provide him his wage from something other than their meat, skins, or saddle cloths.