Sahih Muslim Book 7, Hadith Number 2768.

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? (in his) Farewell Pilgrimage near the time of the appearance of the new moon of Dhu’I-Hijja. The Messenger of Allah (may peace be upon him) said: He who amongst you intends to put on Ihram for Umra may do so; bad I not brought sacrificial animal along with me, I would have put on Ihram for Umra. She (further said). There were some persons who put on Ihram for Umra, and some persons who put on Ihram for Hajj, and I was one of those who put on Ihram for Umra. We went on till we reached Mecca, and on the day of ‘Arafa I found myself In a state of menses, but I did not put off the Ihram for Umra. I told about (this state of mine) to the Apostle of Allah (may peace be upon him), whereupon he said: Abandon your ‘Umra, and undo the hair of your head and comb (them), and put on Ihram for Hajj ‘she(‘Aisha)said: I did accordingly. When it was the night at Hasba and Allah enabled us to complete our Hajj, he (the Holy Prophet) sent with me Abd al-Rahman b. Abu Bakr, and he mounted me behind him on his camel and took me to Tan’im and I put on Ihram for ‘Umra, and thus Allah enabled us to complete our Hajj and Umra and (we wore required to observe) neither sacrifice nor alms nor fasting.