Hadith 508510
Chapter 20: Hajj - كتاب الحج
وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ نَافِعٍ، أَنَّ عَبْدَ اللَّهِ بْنَ عُمَرَ، كَانَ يَقُولُ الْهَدْىُ مَا قُلِّدَ وَأُشْعِرَ وَوُقِفَ بِهِ بِعَرَفَةَ .
Yahya related to me from Malik from Nafi that Abdullah ibn Umar used to say, "A sacrificial animal is what has been garlanded, branded, and stood with on Arafa."
Reference Muwatta Malik 508510
USC-MSA web (English) reference : Book 20, Hadith 148