Sahih Muslim Book 7, Hadith Number 2786.

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 that the Apostle of Allah (may peace be upon him) came out (for Pilgrimage) on The 4th or 5th of Dhu’l Hjjja. The rest of the Hadith is the same, but he (the narrator) made no mention of the doubt of Hakam about his (the Prophet’s) words: “They were reluctant.”