كتاب الحج
15  
The Book of Pilgrimage
(63)
Chapter: It is recommended to sacrifice the camel when it is standing and tied
(63)
باب نَحْرِ الْبُدْنِ قِيَامًا مُقَيَّدَةً ‏‏
Sahih Muslim 1320

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 ‏.‏
Reference : Sahih Muslim 1320
In-book reference : Book 15, Hadith 397
USC-MSA web (English) reference : Book 7, Hadith 3032
  (deprecated numbering scheme)