Abu Da'ud أبو داود السجستاني الأزدي · The Book of ad-Dahaya (Sacrifices)

"Whoever wants to offer a sacrifice when dhul-Hijjah begins, let him not remove anything from his hair or nails." I (the narrator) mentioned that to 'Ikrimah, and he said: "Should he not also keep away from women and perfume?"

"The Messenger of Allah sacrificed two horned, Amlah rams, saying: 'Allah Akbar and pronouncing the Name of Allah. I saw him slaughtering them with his own hand, and placing his foot on their sides." I said: You heard it from Him? He said: Yes. (Sahih )