Sahih Muslim Book - 35, Hadith - 5088

حَدَّثَنَا يَحْيَى بْنُ يَحْيَى ، أَخْبَرَنَا وَكِيعٌ ، عَنْ شُعْبَةَ ، عَنْ قَتَادَةَ ، عَنْ أَنَسٍ ، قَالَ: ضَحَّى رَسُولُ اللهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ بِكَبْشَيْنِ أَمْلَحَيْنِ أَقْرَنَيْنِ ، قَالَ: وَرَأَيْتُهُ يَذْبَحُهُمَا بِيَدِهِ ، وَرَأَيْتُهُ وَاضِعًا قَدَمَهُ عَلَى صِفَاحِهِمَا ، قَالَ: وَسَمَّى وَكَبَّرَ.

It was narrated that Anas said: "The Messenger of Allah (s.a.w) sacrificed two horned black and-white rams. I saw him slaughter them with his own hand, and I saw him placing his foot on their sides, and he said the Name of Allah and he said the Takbir."