(10) The Rites of Pilgrimage
كتاب المناسك
(8a) Chapter: The Sacrificial Animals - Section 1
(7) باب الهدي - الفصل الأول
Mishkat al-Masabih 2637 
Ibn ‘Umar came upon a man who had made his camel kneel and was sacrificing it, so he told him to make it stand up fettered according to the sunna of Muhammad. Bukhari and Muslim.
وَعَن ابنِ عمَرَ: أَنَّهُ أَتَى عَلَى رَجُلٍ قَدْ أَنَاخَ بِدَنَتَهُ يَنْحَرُهَا قَالَ: ابْعَثْهَا قِيَامًا مُقَيَّدَةً سُنَّةَ مُحَمَّدٍ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ
 مُتَّفق عَلَيْهِ  (الألباني)حكم :
Reference : Mishkat al-Masabih 2637
In-book reference : Book 10, Hadith 129