Sahih Muslim Book 7, Hadith Number 2828.

Chapter : Permissibility of the Tamattu’ (form of pilgrimage).

Mutarrif reported: ‘Imran b. Husain sent for me during his illness of which he died, and said: I am narrating to you some ahadith which may benefit you after me. If I live you conceal (the fact that these have been transmitted by me), and if I die, then you narrate them if you like (and these are): I am blessed, and bear in mind that the Messenger of Allah (may peace be upon him) combined Hajj and Umra. Then no verse was revealed in regard to it in the Book of Allah (which abrogated it) and the Apostle of Allah (may peace be upon him) did not forbid (from doing it). And whatever a person (,Umar) said was out of his personal opinion.