Abu Kabash narrated: I brought a six-month-old goat to Madinah and suffered a loss, so I went to Sayyiduna Abu Hurairah (may Allah be pleased with him) and mentioned it to him. He said: I heard the Messenger of Allah (peace and blessings be upon him) say: "A sheep that is eight or nine months old is the best for sacrifice."
Hadith Referenceمسند اسحاق بن راهويه / كتاب الاضاحي / 656
Hadith Takhrij«سنن ترمذي ، ابواب الاضاحي ، باب الجذع من الضان فى الاضاحي ، رقم : 1499 . مسند احمد : 444/2 . قال الشيخ الالباني ، وشعيب الارناوط ، اسناده ضعيفة .»