(2) باب سِنِّ الأُضْحِيَةِ
Amir al-Juhani reported:
Allah's Messenger (ﷺ) distributed sacrificial animals (amongst us for sacrificing them on 'Id al-Adha). So we sacrificed them. There fell to my lot a lamb of less than one year I said: Allah's Messenger, there has fallen to my lot a lamb (Jadha'a), whereupon he said: Sacrifice that.
Reference: Sahih Muslim 1965 b
In-book reference: Book 35, Hadith 22
USC-MSA web (English) reference(deprecated numbering scheme): Book 22, Hadith 4839