(1) باب وَقْتِهَا
Al-Bara' b. 'Azib reported:
Allah's Messenger (ﷺ) addressed us on the day of Nahr and said: None should sacrifice the animal unless he has completed the ('Id) prayer. A person said: I have a milch goat of less than one year, better than two fat goats. Thereupon he said: Sacrifice it, and no goat of less than a year of age will be accepted as sacrifice after you.
Reference: Sahih Muslim 1961 h
In-book reference: Book 35, Hadith 13
USC-MSA web (English) reference(deprecated numbering scheme): Book 22, Hadith 4830