(Imām Bukhārī narrates): Musaddad narrated to us, he said: Isma'il narrated to us from Ayyub from Muhammad from Anas, may Allāh be pleased with him, he said that the Prophet ﷺ said:
Whoever slaughtered the sacrificial animal before the Eid prayer, let him slaughter again. Then a man stood up and said: On this day meat is desired, and he mentioned his neighbour, so it was as if the Prophet ﷺ confirmed it. That man said: I have a six-month-old kid, which to me is more pleasing than the meat of two goats. So the Prophet ﷺ gave him permission for it. So I do not know whether this concession reached others besides him or not.
Reference: Sahih Al Bukhari 954