An Ansari man, who was in charge of the sacrificial animals of the Prophet (peace and blessings be upon him), narrates: When the Prophet (peace and blessings be upon him) sent him off, I came back and said: O Messenger of Allah! If any of them breaks down (and is no longer fit to travel), what do you command me to do with it? The Prophet (peace and blessings be upon him) said: "Sacrifice it, dye its sandal in its blood and with it make a mark on its side (the narrator is unsure about one word here), and neither you nor any one of your companions should eat from it."
Ahmad recorded it. Its chain contains a narrator, Layth bin Abi Sulaym, who is thiqah (trustworthy), but he is a mudallis (one who practises tadlis).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الحج / 5402