Abdullah bin Qurt reported,

The Prophet ﷺ said, "The greatest of days before Allah تبارك وتعالى is the Day of Sacrifice, then the Day of Rest," which is the second day.He said, Five or six sacrificial camels were brought close to the Messenger of Allah ﷺ, and they began pressing forward toward him, each eager to be the first he would slaughter. When their sides fell to the ground, he uttered some words quietly which I could not make out.I asked, "What did he say?"He replied, "Whoever wishes may cut off a portion."

Azami 5356

Sahih

عن عبد الله بن قرط

عن النبي ﷺ قال: إن أعظم الأيام عند الله تبارك وتعالى يوم النحر، ثم يوم القر. وهو اليوم الثاني. قال: وقرب لرسول الله ﷺ بدنات خمس أو ست، فطفقن يزدلفن إليه بأيتهن يبدأ، فلما وجبت جنوبها قال: فتكلم بكلمة خفية لم أفهمها. فقلت: ما قال؟ قال: من شاء اقتطع.

الأعظمي 5356صحيح
Contents
Reference
Commentary
Ayat
Collection
Jami al-Kamil
Book
Hajj
Chapter
Sacrificial animals and their rulings
Section
Slaughtering camels standing without being hobbled, or with the left leg hobbled
Numbering
Jami al-Kamil 5356 (2nd edition)
Azami 5356