Sunan Ibn Majah, Volume 4, Book 25, Hadith 2917 (DarusSalam) ⓘ
It was narrated that Anas bin Malik said: “I was by the knees of the she-camel of the Messenger of Allah, at Shajarah. When it rose up with him, he said: ‘Labbaika bi ‘Umrah wa Hajjah ma’an [Here I am (O Allah) for ‘Umrah and Hajj together].’ That was during the Farewell Pilgrimage.”
حَدَّثَنَا عَبْدُ الرَّحْمَنِ بْنُ إِبْرَاهِيمَ الدِّمَشْقِيُّ، حَدَّثَنَا الْوَلِيدُ بْنُ مُسْلِمٍ، وَعُمَرُ بْنُ عَبْدِ الْوَاحِدِ، قَالاَ حَدَّثَنَا الأَوْزَاعِيُّ، عَنْ أَيُّوبَ بْنِ مُوسَى، عَنْ عَبْدِ اللَّهِ بْنِ عُبَيْدِ بْنِ عُمَيْرٍ، عَنْ ثَابِتٍ الْبُنَانِيِّ، عَنْ أَنَسِ بْنِ مَالِكٍ، قَالَ إِنِّي عِنْدَ ثَفِنَاتِ نَاقَةِ رَسُولِ اللَّهِ ـ صلى الله عليه وسلم ـ عِنْدَ الشَّجَرَةِ فَلَمَّا اسْتَوَتْ بِهِ قَائِمَةً قَالَ " لَبَّيْكَ بِعُمْرَةٍ وَحَجَّةٍ مَعًا " . وَذَلِكَ فِي حَجَّةِ الْوَدَاعِ .
also referenced under: Hadith 2917 (Reference) & Book 25, Hadith 3029 (In-Book)