The Messenger of Allah ﷺ led us in the Zuhr prayer in Madinah, performing four units, and then prayed Asr at Dhul-Hulayfah, performing two units. He spent the night there until morning, then mounted his riding animal, and when it had risen with him onto Bayda... The hadith continues. It includes, The Prophet ﷺ slaughtered the sacrificial camels with his own hand while they were standing.
صلى رسول الله ﷺ ونحن معه بالمدينة الظهر أربعا، والعصر بذي الحليفة ركعتين، ثم بات بها حتى أصبح، ثم ركب حتى استوت به على البيداء… الحديث. وفيه: ونحر النبي ﷺ بدنات بيده قياما.
Bukhari narrated it in the book of Hajj (1551) from Musa bin Ismail, who said, Wahib narrated to us, who said, Ayub narrated to us, from Abu Qilaba, from Anas, and he related it.Muslim also recorded it (690) through another route from Ayub with his chain of transmission, in shortened form, and he did not mention in it the Prophet's ﷺ sacrifice.Bayhaqi also recorded it (5/237) through the route of Muhammad bin Husayn bin Abu Hunayn, the author of the Musnad, from Bukhari's teacher Musa bin Ismail with his chain of transmission, and he added in it, "seven sacrificial camels."His statement, "seven sacrificial camels," is not found in the narration of Musa bin Ismail to which Bayhaqi referred.But Bukhari narrated it (1714) from Sahl bin Bakkar, who said, Wahib narrated to us with his chain of transmission, and mentioned in it that the Prophet ﷺ slaughtered with his own hand seven sacrificial camels while they were standing. It would therefore have been more fitting for Bayhaqi to refer to the narration of Sahl bin Bakkar.This is something that Anas himself witnessed, for otherwise he ﷺ sacrificed sixty-three camels, as Jabir reported.