Sayyiduna Abu Hurayrah (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings be upon him) said: "The blood of a whitish (animal) is more beloved to Allah than the blood of two black ones."
(b) Salma bin Attab says: I heard Sayyiduna Abu Hurayrah (may Allah be pleased with him) say: The blood of a white (animal) is more beloved to me than the blood of two black ones.
Al-Bukhari said: Some of them narrate it as marfu' (from the Prophet), and that is not authentic.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الضحايا / 19090