It is narrated from Hujayyah bin Adi that a man asked Sayyiduna Ali (may Allah be pleased with him) about a cow, and he said: It is (sufficient) on behalf of seven people. He asked: What if its horn is (broken)? He said: That will not harm you. He asked: What if it is lame? He said: If it reaches the place of slaughter by walking (then it is permissible). And he further said that the Messenger of Allah (peace and blessings be upon him) had commanded us to examine the eye and the ear (of the sacrificial animal) carefully.