I heard Jurayy bin Kulaib say: I heard ‘Ali ؓ say: The Messenger of Allah ﷺ forbade (sacrificing) an animal that had lost most of its horn or ear. Qatadah said: I asked Saʿeed bin Al-Musayyab: What does lost most of its ear mean? He said: If it has lost half or more of it.
سَمِعْتُ عَلِيًّا يَقُولُ نَهَى رَسُولُ اللهِ ﷺ عَنْ عَضَبِ الْقَرْنِ وَالْأُذُنِ قَالَ قَتَادَةُ فَسَأَلْتُ سَعِيدَ بْنَ الْمُسَيِّبِ قَالَ قُلْتُ مَا عَضَبُ الْأُذُنِ؟ فَقَالَ إِذَا كَانَ النِّصْفَ أَوِ اكْثَرَ مِنْ ذَلِكَ