The Messenger of Allah ﷺ said, "Whoever enters ihram for Hajj and Umra together, a single tawaf and a single saee will suffice him for both, until he exits ihram from both of them at once."
حدثنا خلاد بن أسلم البغدادي حدثنا عبد العزيز بن محمد عن عبيد الله بن عمر عن نافع
قال رسول الله ﷺ من أحرم بالحج والعمرة أجزأه طواف واحد وسعي واحد عنهما حتى يحل منهما جميعا
[Its chain of transmission is sahih] Ibn Majah narrated it in the Chapters on Rites, in the Chapter on the Tawaf of Someone Combining Hajj and Umrah, no. 2975, from the hadith of Abdul-Aziz bin Muhammad Darawardi through the same route, and it has a flaw that does not affect its soundness. Ibn Khuzayma graded it sahih, no. 2745, as did Ibn Hibban, no. 993, and Ibn Jarud, no. 460.