al-Qasim bin Salam القاسم بن سلام · The Book of ad-Dahaya (Sacrifices)

"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 )