Ibn Abi Su'ayr (may Allah be pleased with him) narrates that the Prophet (peace and blessings be upon him) looked over the slain of Uhud and said: "Indeed, I am a witness over these people; wrap them in their blood and their wounds."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجنائز / 6800