I heard the Prophet ﷺ pronouncing the talbiyah for Umra and Hajj together. I mentioned this to Ibn Umar, who said, "He pronounced the talbiyah for Hajj alone."Then I met Anas and told him what Ibn Umar had said. Anas replied, "You consider us nothing but children. I heard the Messenger of Allah ﷺ say, 'Here I am for Umra and Hajj together.'"
أخبرنا يعقوب بن إبراهيم قال حدثنا هشيم قال حدثنا حميد الطويل قال أنبأنا بكر بن عبد الله المزني قال سمعت
سمعت النبي ﷺ يلبي بالعمرة والحج جميعا فحدثت بذلك ابن عمر فقال لبى بالحج وحده فلقيت أنسا فحدثته بقول ابن عمر فقال أنس ما تعدونا إلا صبيانا سمعت رسول الله ﷺ يقول لبيك عمرة وحجا معا
This was narrated by Muslim in the Book of Hajj, chapter on doing ifrad and qiran together, hadith no. 1232, from the narration of Hushaym. Bukhari narrated it in the Book of Military Expeditions, chapter on sending Ali bin Abu Talib and Khalid bin Walid to Yemen before the Farewell Hajj, hadith nos. 4353 and 4354, from the narration of Humayd Tawil, with the same wording. It is also found in Al-Kubra, hadith no. 3711.