Lajnah Ad Daimah was asked:
ما حكم أضحية من ضحى لوالديه،
وهو حالق لحيته أو قاص أظافره خلال عشر ذي الحجة؟
What is the ruling of the slaughter of the one who slaughters for his parents whilst he is from those who shaves his beard, or clips his nails during the first ten days of Thull Hijjah?
ج1: أضحيته صحيحة سواء كانت عن نفسه أو عن والديه،
His slaughter is correct whether it be for himself or for his parents,
ولا يبطلها حلق لحيته أو قص أظافره خلال الأيام العشر قبل الذبح أو نحر الضحية،
[Him] shaving his beard or clipping his nails during the first ten days before the slaughter or the sacrifice doesn’t nullify it.
وقد أساء بقص أظافره في تلك الأيام، وارتكب منكرًا بحلق لحيته مطلقًا، إلا أن حلقها في تلك الأيام أشد.
He has done bad with clipping his nails in those days and committed an evil unrestrictedly with shaving his beard, except that shaving it in those ten days is more severe. End quote.
A Side Note: If one were to clip his nails or remove hair out of ignorance or forgetfulness, then he isn’t included in this because this is regarding one who does it intentionally. As for the one who makes a mistake or forgets, then as Allah says:
رَبَّنَا لاَ تُؤَاخِذْنَا إِن نَّسِينَا أَوْ أَخْطَأْنَا
Our Lord! Punish us not if we forget or fall into error.
AbdulFattaah bin Uthman