(7) باب مَا جَاءَ فِي الْجَذَعِ مِنَ الضَّأْنِ فِي الأَضَاحِي
Narrated 'Uqbah bin 'Amir:
That the Messenger of Allah (ﷺ) gave him sheep to distribute among his Companions as a sacrifice. "There remained a young male kid or a young billy goat, so I mentioned that to the Messenger of Allah (ﷺ) and he said: 'Sacrifice it for yourself.'"Waki' said: "The Jadha' among sheep is seven or six months."
Reference: Jami` at-Tirmidhi 1500
In-book reference: Book 19, Hadith 10
English translation: Vol. 3, Book 17, Hadith 1500