When the Messenger of Allah ﷺ sacrificed his sacrificial camels, he slaughtered thirty of them with his own hand, then instructed me to slaughter the rest, which I did.
حدثنا هارون بن عبد الله حدثنا محمد ويعلى ابنا عبيد قالا حدثنا محمد بن إسحق عن ابن أبي نجيح عن مجاهد عن عبد الرحمن بن أبي ليلى
لما نحر رسول الله ﷺ بدنه فنحر ثلاثين بيده وأمرني فنحرت سائرها
[Its chain of transmission is daif] Ahmad narrated it: 1/159, 160 from Muhammad bin Ubayd through this route. Muhammad bin Ishaq narrated with "an" without clarifying direct hearing, and it contains another defect.