وَحَدَّثَنِي مَالِكٌ، عَنْ نَافِعٍ، أَنَّ عَبْدَ اللَّهِ بْنَ عُمَرَ، كَانَ يَقُولُ فِي الضَّحَايَا وَالْبُدْنِ الثَّنِيُّ فَمَا فَوْقَهُ ‏.‏

Yahya related to me from Malik from Nafi that Abdullah ibn Umarused to say, about sacrificial animals, "Six-year-old camels, three-year-old cows and sheep, or older than these." Translation Not Available

Book Ref: Muwatta Imam Malik Book 20 Hadith 854
Web Ref:  Muwatta Imam Malik Book 20 Hadith 151