The one who performs the Adhha sacrifice with his Wealth should not remove any of his Hair

Question :

Who is the person for whom it is forbidden to remove anything from his hair or his nails during the 10 days of Thul-Hijjah? Is it the person who slaughters the animal or the person for whom the Adhha sacrifice is for if he is alive, regardless of whether it is for him alone or with a group?

Answer:

The person for whom it is forbidden to remove anything from his hair or nails or anything of his skin after the month of Thul-Hijjah begins, is the one who performs the sacrifice with his wealth for himself or for someone else or for himself and someone else together. This is due to the statement of the Prophet :
"When the month of Thul-Hijjah begins and one of you wants to perform the Adhha sacrifice, then he should not remove any of his hair or his nails or his skin."

This was recorded by Imam Muslim in his Sahih from a Hadith of Umm Salamah. In reference to whoever the sacrifice is performed on his behalf, like the children of the one performing the sacrifice and his wife, if he performs the sacrifice for himself and his household members, it is not forbidden for them to remove their hair and nails. This is because they are not performing the Adhha sacrifice. The one who is actually performing the sacrifice is the one who pays the price of the sacrifice from his wealth according to the most correct opinion of the scholars. Likewise, the person who is appointed to perform the slaughter (for someone else), there is no sin on him for removing some of his hair and nails, because he is not the person performing the Adhha sacrifice. And Allâh is the Giver of success.

Source:
Ash-Shaykh Ibn Baz
Fatawa Islamiyah, Vol. 4 Pages 324-325