The Book of Pilgrimage
15/63. Chapter:
It is recommended to sacrifice the camel when it is standing and tied
Sahih Muslim
حَدَّثَنَا يَحْيَى بْنُ يَحْيَى، أَخْبَرَنَا خَالِدُ بْنُ عَبْدِ اللَّهِ، عَنْ يُونُسَ، عَنْ زِيَادِ بْنِ جُبَيْرٍ، أَنَّ ابْنَ عُمَرَ، أَتَى عَلَى رَجُلٍ وَهُوَ يَنْحَرُ بَدَنَتَهُ بَارِكَةً فَقَالَ ابْعَثْهَا قِيَامًا مُقَيَّدَةً سُنَّةَ نَبِيِّكُمْ صلى الله عليه وسلم .
Ziyad b. Jubair reported that Ibn 'Umar came upon a person who was slaughtering (sacrificing) his camel and had made him kneel down. So he told him to make it stand up festered (and then sacrifice it) according to the Sunnah of the Prophet (ﷺ).
Reference : Sahih Muslim 1320In-book reference : Book 15, Hadith 397USC-MSA web (English) reference : Book 7, Hadith 3032