A Marfu' narration (from the Prophet ﷺ), saying: "A crippled animal whose limp is obvious is not to be slaughtered as sacrifice, nor an animal with a bad eye whose blindness is obvious, nor a sick animal whose sickness is obvious, nor an emaciated animal that has no marrow (in its bones)." (Using translation from Tirmidhī 1497)   

سُئِلَ رَسُولُ اللَّهِ ﷺ مَا يُتَّقَى مِنَ الضَّحَايَا؟ قَالَ «الْعَوْرَاءُ الْبَيِّنُ عَوَرُهَا وَالْعَرْجَاءُ الْبَيِّنُ ظَلْعُهَا وَالْمَرِيضَةُ الْبَيِّنُ مَرَضُهَا وَالْعَجْفَاءُ الَّتِي لَا تُنْقِي»  

“I heard ‘Ubaid bin Fairuz say: ‘I said to Bara’ bin ‘Azib: “Tell us of the sacrificial animals that the Messenger of Allah ﷺ disliked or forbade.” He said: “Allah’s Messenger ﷺ said like this with his hand. And my hand is shorter than his hand:* ‘There are four that will not be accepted as sacrifices: The one-eyed animal that is obviously blind in one eye; the sick animal that is obviously sick; the lame animal with an obvious limp; and the animal that is so emaciated that it is as if there is no marrow in its bones.’” He said:** “And I dislike that the animal should have some fault in its ears.” He said: “What you dislike, forget about it and do not make it forbidden to anyone.” (Using translation from Ibn Mājah 3144)   

سَأَلْتُ الْبَرَاءَ عَمَّا نَهَى رَسُولُ اللَّهِ ﷺ مِنَ الْأَضَاحِيِّ فَقَالَ أَرْبَعٌ لَا يُجْزِئْنَ الْعَوْرَاءُ الْبَيِّنُ عَوَرُهَا وَالْعَرْجَاءُ الْبَيِّنُ ظَلْعُهَا وَالْمَرِيضَةُ الْبَيِّنُ مَرَضُهَا وَالْكَسِيرُ الَّتِي لَا تُنْقِي قَالَ قُلْتُ لِلْبَرَاءِ فَإِنِّي أَكْرَهُ أَنْ يَكُونَ فِي السِّنِّ نَقْصٌ وَفِي الْأُذُنِ نَقْصٌ وَفِي الْقَرْنِ نَقْصٌ قَالَ فَمَا كَرِهْتَ فَدَعْهُ وَلَا تُحَرِّمْهُ عَلَى أَحَدٍ  

The Messenger of Allah ﷺ commanded us to check the eyes and ears [when selecting an animal for sacrifice] (Using translation from Aḥmad 732)  

«أَمَرَنَا رَسُولُ اللَّهِ ﷺ أَنْ نَسْتَشْرِفَ الْعَيْنَ وَالْأُذُنَ»  

[Machine] "The Messenger of Allah ﷺ commanded us to trim the eye and ear, and not to shave, trim, or pierce." So, "trimming" refers to cutting the edge of the ear, "shaving" refers to cutting from the side of the ear, "pierced" refers to a perforated (eared?) one, and "split" refers to a split one.  

«أَمَرَنَا رَسُولُ اللَّهِ ﷺ أَنْ نَسْتَشْرِفَ الْعَيْنَ وَالْأُذُنَ وَأَنْ لَا نُضَحِّيَ بِمُقَابَلَةٍ وَلَا مُدَابَرَةٍ وَلَا خَرْقَاءَ وَلَا شَرْقَاءَ» فَالْمُقَابَلَةُ مَا قُطِعَ طَرَفُ أُذُنِهَا وَالْمُدَابَرَةُ مَا قُطِعَ مِنْ جَانِبِ الْأُذُنِ وَالْخَرْقَاءُ الْمَثْقُوبَةُ وَالشَّرْقَاءُ الْمَشْقُوقَةُ