Sayyiduna Abu Umamah (may Allah be pleased with him) says that the Messenger of Allah (peace and blessings be upon him) said: "The best sacrifice is a horned ram." (b) Sayyiduna Ubadah bin al-Samit (may Allah be pleased with him) says that the Messenger of Allah (peace and blessings be upon him) said: "The best sacrifice is a horned ram, and the best shroud is a white cloth."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الضحايا / 19089