"I saw him: - meaning the Prophet - "slaughtering them with his own hand, and placing his foot on their sides, pronouncing the name of Allah and saying: 'Allah Akbar,' (sacrificing) two horned, Amlah rams." (Sahih )  

لَقَدْ رَأَيْتُهُ يَعْنِي النَّبِيَّ ﷺ يَذْبَحُهُمَا بِيَدِهِ وَاضِعًا عَلَى صِفَاحِهِمَا قَدَمَهُ يُسَمِّي وَيُكَبِّرُ كَبْشَيْنِ أَمْلَحَيْنِ أَقْرَنَيْنِ