It is narrated from Aisha (may Allah be pleased with her) that she said: We set out with the Messenger of Allah (ﷺ) in the year of the Farewell Pilgrimage. Among us were some who entered into the state of Ihram for Hajj, and among us were some who entered into the state of Ihram for Umrah, and among us were some who combined Hajj and Umrah. And I was among those who entered into the state of Ihram for Umrah.
Hadith Referenceمسند الإمام الشافعي / كتاب الحج / 811
Hadith Takhrijاخرجه البخاري، الحج، باب كيف تهل الحائض والنفساء (1556) ومسلم، الحج، باب بيان وجوه الإحرام، وأنه يجوز إفراد الحج... الخ (1211)۔