When the month of Dhul-Hijjah enters, it is not permissible for the one who intends to sacrifice to cut his hair

Question: A woman who feels she cannot refrain from cutting her hair, and who possesses wealth, is it permissible for her to give it to one of her relatives to buy the sacrificial animal and make the intention on her behalf?

Answer: It is obligatory for one who intends to sacrifice for himself, or for his parents, or for someone else voluntarily, not to take anything from his hair, or his nails, or his skin when the month of Dhul-Hijjah enters until he sacrifices.
As for the agent, there is no blame on him if he takes from his hair, or his skin, or his nails; due to the saying of the Prophet (peace and blessings be upon him): . It was narrated by Muslim in the Sahih.