He narrated from the Messenger of Allah ﷺ that he laid down his sacrificial animal on its side to slaughter it, and the Messenger of Allah ﷺ said to a man, "Help me with my sacrifice," so the man helped him.
حدثنا هاشم حدثنا ليث حدثنا يزيد بن أبي حبيب عن أبي الخير أن
حدثه عن رسول الله ﷺ أنه أضجع أضحيته ليذبحها فقال رسول الله ﷺ لرجل أعني على ضحيتي فأعانه
Its isnad is sahih. Haythami said in 4/25, "Its narrators are the narrators of the Sahih."