The Messenger of Allah ﷺ prayed Zuhr at Dhul Hulayfah, then called for his she-camel and made an incision on the right side of its hump, wiped away the blood, and hung two sandals around its neck as a marker. He then mounted his riding camel, and when it stood up with him on the open plain of Bayda, he entered the state of ihram for Hajj.
صلى رسول الله ﷺ الظهر بذي الحليفة، ثم دعا بناقته فأشعرها في صفحة سنامها الأيمن، وسلت الدم، وقلدها نعلين، ثم ركب راحلته، فلما استوت به على البيداء أهل بالحج.
Narrated by Muslim in the book of Hajj (1243) via Qatada, from Abu Hassan (al-Aaraj, whose name was Muslim bin Abdullah al-Basri), from Ibn Abbas, and he related it.Tirmidhi said following the hadith of Ibn Abbas (906), "I heard Abu Saaib say, 'We were with Waki, and he said to a man present who was among those who engaged in personal legal reasoning, "The Messenger of Allah ﷺ marked (his sacrificial animal)." The man said, "But Abu Hanifa says this is mutilation, for it has been related from Ibrahim Nakhai that he said, marking is mutilation." He said, 'I saw Waki become extremely angry, and he said, "I tell you the Messenger of Allah ﷺ said this, and you tell me Ibrahim said that! You deserve to be detained and not released until you retract this statement of yours."'"As for his saying, "and he marked it," marking means cutting the animal on the right side of its hump with a spear, knife, or similar implement, then wiping away the blood from it. The root meaning of ishaar (marking) and shuur is to inform and to mark, and the marking of the sacrificial animal is because it serves as a sign for it, so that it may be known to be a sacrificial offering. If it strays, whoever finds it will return it, and it will not be mixed up with other animals.