Sahih Bukhari Volume 001, Book 006, Hadith Number 313.
Narated By 'Aisha : In the last Hajj of Allah's Apostle I assume the Ihram for Hajj along with Allah Apostle. I was one of those who intended Tamattu' (to perform Hajj an 'Umra) and did not take the Hadi (animal for sacrifice) with me. I got my menses and was not clean till the night of 'Arafa I said, "O Allah's Apostle! It is the night of the day of 'Arafat and I intended to perform the Hajj Tamattu' with 'Umra Allah's Apostle told me to undo my hair and comb it and to postpone the 'Umra. I did the same and completed the Hajj. On the night of Al-Hasba (i.e. place outside Mecca where the pilgrims go after finishing all the ceremonies Hajj at Mina) he (the Prophet ordered 'Abdur Rahman ('Aisha's brother) to take me to At-Tan'im to assume the lhram for'Umra in lieu of that of Hajj-atTamattu' which I had intended to perform.