Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) narrates that the Noble Prophet (peace and blessings be upon him) sent eighteen sacrificial camels with a man and gave him instructions regarding them. The man returned and asked: If any of them becomes weak, what is the ruling? The Prophet said: Slaughter it, then dye its collar with its blood and place it on its side, and neither you nor any of your companions should eat from it.
Hadith Referenceالمنتقى ابن الجارود / كتاب المناسك / 425