He heard the Messenger of Allah ﷺ forbid people from eating the meat of their sacrifices beyond three days.
حدثنا يعقوب حدثنا أبي عن محمد بن إسحاق حدثني الزهري
أنه سمع رسول الله ﷺ ينهى الناس أن يأكلوا لحوم نسكهم فوق ثلاثة أيام
Its isnad is sahih, and it is a repeat of 4900, see also 5526, 5527.Nusuk, with the nun and the sin (both unpointed) vowelled with a damma, is also the plural of nasikah, meaning the sacrificial animal.