Narrated 'Uqba bin 'Amir: that the Prophet gave him some sheep to distribute among his companions to slaughter as sacrifices ('Id--al--Adha). A kid was left and he told the Prophet of that whereupon he said to him, "Slaughter it as a sacrifice (on your behalf)."
— Sahih Bukhari, Volume 7, Book 68: Al-Adha Festival Sacrifice (Adaahi), Hadith #462