Jami` at-Tirmidhi 948
جامع الترمذي#948SahihIbn Umar narrated that:The Messenger of Allah said: "Whoever assumes Ihram for Hajj and Umrah, then it is acceptable for him to perform one Tawaf and one Sa'I for them both, until he exits Ihram for both of them together
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Ahmad Muhammad ShakirSahih
Al-AlbaniSahih
Zubair Ali ZaiIsnaad Sahih
In-book reference: 9:142