Sunan al-Nasa'i
The Book of ad-Dahaya (Sacrifices) — Hadith #4427
أَخْبَرَنَا الْقَاسِمُ بْنُ زَكَرِيَّا بْنِ دِينَارٍ، قَالَ حَدَّثَنَا مُصْعَبُ بْنُ الْمِقْدَامِ، عَنِ الْحَسَنِ، - يَعْنِي ابْنَ صَالِحٍ - عَنْ شُعْبَةَ، عَنْ قَتَادَةَ، عَنْ أَنَسٍ، قَالَ لَقَدْ رَأَيْتُهُ - يَعْنِي النَّبِيَّ صلى الله عليه وسلم - يَذْبَحُهُمَا بِيَدِهِ وَاضِعًا عَلَى صِفَاحِهِمَا قَدَمَهُ يُسَمِّي وَيُكَبِّرُ كَبْشَيْنِ أَمْلَحَيْنِ أَقْرَنَيْنِ .
“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 )
Chain of Narration (Isnad)