Sahih Muslim Book 7, Hadith Number 2824.
Chapter : Permissibility of the Tamattu’ (form of pilgrimage).
Mutarrif reported: ‘Imran b. Husain said to me: Should I not narrate to you a Hadith today by which Allah will benefit you subsequently-and bear in mind that Allah’s Messenger (may peace be upon him) made some members of his family perform ‘Umra within ten days of Dhu’l-Hijja. No verse was revealed to abrogate that, and he (the Holy Prophet) did not refrain from doing it till he died. So after him everyone said as he liked, (but it would be his personal opinion and not the verdict of the Shari’ah).