Muwatta Malik
Book 20, Hadith 142
Arabic hadith text
وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ يَحْيَى بْنِ سَعِيدٍ، أَنَّ عُمَرَ بْنَ عَبْدِ الْعَزِيزِ، أَهْدَى جَمَلاً فِي حَجٍّ أَوْ عُمْرَةٍ .
Translation
Yahya related to me from Malik from Yahya ibn Said that Umar ibnAbd al-Aziz once sacrificed a camel during a hajj or an umra.