مِشْكَاةُ الْمَصَابِيحِ
Mishkat al-Masabih 2637
The Rites of Pilgrimage
The Sacrificial Animals - Section 1
وَعَن ابنِ عمَرَ: أَنَّهُ أَتَى عَلَى رَجُلٍ قَدْ أَنَاخَ بِدَنَتَهُ يَنْحَرُهَا قَالَ: ابْعَثْهَا قِيَامًا مُقَيَّدَةً سُنَّةَ مُحَمَّدٍ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ
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.
Mishkat al-Masabih, 2637مُتَّفق عَلَيْهِ (الألباني)