This hadith has been reported by 'Auza'i with the same chain of transmitters: We used to slaughter the camel during the lifetime of the Messenger of Allah (ﷺ) after the 'Asr prayer, but he made no mention of: "We used to pray along with him."
Hadith ReferenceSahih Muslim / The Book of Mosques and Places of Prayer / Hadith: 625