al-Sharif al-Radi (d. 406 AH) · Thaqalayn library edition, reproduced verbatim
وَ مِنْ تَمامِ الاْضْحِيَّةِ اسْتِشْرافُ اُذُنِها، وَ سَلامَةُ عَيْنِها. فَاِذا سَلِمَتِ الاْذُنُ وَالْعَيْنُ سَلِمَتِ الاْضْحِيَّةُ وَ تَمَّتْ، وَلَوْ كانَتْ عَضْباءَ لْقَرْنِ تَجُرُّ رِجْلَها اِلَى الْمَنْسَكِ.
For an animal to be fully fit for sacrifice it is necessary that both its ears should be raised upwards and its eyes should be healthy. If the ears and the eyes are sound the animal of sacrifice is sound and perfect, even though its horn be broken or it drags its feet to the place of sacrifice.
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