The Book of ad-Dahaya (Sacrifices)
43/8. Chapter:
An Animal With Its Ears Slit From The Front
Sunan an-Nasai
أَخْبَرَنِي مُحَمَّدُ بْنُ آدَمَ، عَنْ عَبْدِ الرَّحِيمِ، - وَهُوَ ابْنُ سُلَيْمَانَ - عَنْ زَكَرِيَّا بْنِ أَبِي زَائِدَةَ، عَنْ أَبِي إِسْحَاقَ، عَنْ شُرَيْحِ بْنِ النُّعْمَانِ، عَنْ عَلِيٍّ، رضى الله عنه قَالَ أَمَرَنَا رَسُولُ اللَّهِ صلى الله عليه وسلم أَنْ نَسْتَشْرِفَ الْعَيْنَ وَالأُذُنَ وَأَنْ لاَ نُضَحِّيَ بِمُقَابَلَةٍ وَلاَ مُدَابَرَةٍ وَلاَ بَتْرَاءَ وَلاَ خَرْقَاءَ .
It was narrated that 'Ali, may Allah be pleased with him, said: "The Messenger of Allah commanded us to examine the eyes and ears (of animals), and no0t to sacrifice and animals with its ears slit from the front, and animal with its ears slit form the back, a animal with its tail cut, nor an animals with a round hole in its ear."
Reference : Sunan an-Nasa'i 4372In-book reference : Book 43, Hadith 12English translation : Vol. 5, Book 43, Hadith 4377