It is narrated from Sayyiduna Ali (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) commanded us to carefully examine the eyes and ears of the sacrificial animal, and forbade sacrificing an animal whose ear is cut from the front or back, or has a hole in it, or is torn, or whose other body parts are cut.
Hadith Referenceمسند احمد / مسند الخلفاء الراشدين / 1061
Hadith Gradingحکم دارالسلام:حسن، أبو إسحاق لم يسمع هذا الحديث من شريح بن النعمان