The Book of ad-Dahaya (Sacrifices)
43/14. Chapter:
Rams
Sunan an-Nasai
أَخْبَرَنَا قُتَيْبَةُ، قَالَ حَدَّثَنَا أَبُو عَوَانَةَ، عَنْ قَتَادَةَ، عَنْ أَنَسٍ، قَالَ ضَحَّى النَّبِيُّ صلى الله عليه وسلم بِكَبْشَيْنِ أَمْلَحَيْنِ أَقْرَنَيْنِ ذَبَحَهُمَا بِيَدِهِ وَسَمَّى وَكَبَّرَ وَوَضَعَ رِجْلَهُ عَلَى صِفَاحِهِمَا .
It was narrated that Anas said: "The Prophet sacrificed two horned, Amlah rams, slaughtering them with his own hand, pronouncing the name of Allah, and saying: 'Allahu Akbar, and placing his foot on their sides."
Reference : Sunan an-Nasa'i 4387In-book reference : Book 43, Hadith 27English translation : Vol. 5, Book 43, Hadith 4392