Sahih Muslim Book 7, Hadith Number 2770.

Chapter : Types of Ihram- It is permissible to enter into the state of Ihram singularly for the sake of Hajj or for tamattu’ bi’l-‘umra ila’l-Hajj or for both hajj and ‘umra together.

‘Aisha (Allah be pleased with her) reported: We went with the Messenger of Allah (may peace be upon him) at the appearance of the new moon of Dhu’I-Hijja. There were amongst us those who had put on Ihram for Umra, and those also who had put on Ihram both for Hajj and Umra, and still those who had put on Ihram for Hajj (alone). I was one of those who had put on Ihram for. Umra (only). ‘Urwa (one of the narrators) said: Allah enabled her (Hdrat ‘Aisha) to complete both Hajj and Umra (according to the way as mentioned above). Hisham (one of the narrators) said: She had neither the sacrificial animal nor (was she required to) fast, nor (was she obliged to give) alms.