Sahih Muslim
Book 15: The Book of Pilgrimage
كتاب الحج
601 hadith in this book
Chapter 63 It is recommended to sacrifice the camel when it is standing and tied
باب نَحْرِ الْبُدْنِ قِيَامًا مُقَيَّدَةً
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).
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 .
Hadith text, translations and grading are courtesy of Sunnah.com.