I heard Hujayyah bin Adiyy say: I heard ʿAli bin Abi Talib ؓ When a man asked him about a cow. He said: “(It may be sacrificed) on behalf of seven.” He asked him about the animal that is lame. He said: “If it can reach the place of sacrifice (then sacrifice it).” He was asked about the horn. He said: “It doesnʿt matter.” And ‘Ali ؓ said: The Messenger of Allah ﷺ instructed us to check the eye and ear.
وَقَالَ عَلِيٌّ أَمَرَنَا رَسُولُ اللهِ ﷺ أَنْ نَسْتَشْرِفَ الْعَيْنَ وَالْأُذُنَ