Abu Husayn (may Allah have mercy on him) said that Sayyiduna Abdullah bin al-Zubayr (may Allah be pleased with them both) saw among his sacrificial animals (hady) a she-camel blind in one eye, and he said: If the defect befell it after you bought it, then go ahead with it; and if it befell it before you bought it, then replace it.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الضحايا / 19195