from Yemen and was assuming Ihram for Hajj

Pilgrimmage (Hajj)
Bukhari :: Book 2 :: Volume 26 :: Hadith 634
Narrated Marwan bin Al-Hakam:

I saw 'Uthman and 'Ali. 'Uthman used to forbid people to perform Hajj-at-Tamattu' and Hajj-al-Qiran (Hajj and 'Umra together), and when 'Ali saw (this act of 'Uthman), he assumed Ihram for Hajj and 'Umra together saying, "Lubbaik for 'Umra and Hajj," and said, "I will not leave the tradition of the Prophet on the saying of somebody."


Bukhari :: Book 2 :: Volume 26 :: Hadith 635
Narrated Ibn Abbas:

The people (of the Pre-lslamic Period) used to think that to perform 'Umra during the months of Hajj was one of the major sins on earth. And also used to consider the month of Safar as a forbidden (i.e. sacred) month and they used to say, "When the wounds of the camel's back heal up (after they return from Hajj) and the signs of those wounds vanish and the month of Safar passes away then (at that time) 'Umra is permissible for the one who wishes to perform it." In the morning of the 4th of Dhul-Hijja, the Prophet and his companions reached Mecca, assuming Ihram for Hajj and he ordered his companions to make their intentions of the Ihram for'Umra only (instead of Hajj) so they considered his order as something great and were puzzled, and said, "O Allah's Apostle! What kind (of finishing) of Ihram is allowed?" The Prophet replied, "Finish the Ihram completely like a non-Muhrim (you are allowed everything)."


Bukhari :: Book 2 :: Volume 26 :: Hadith 636
Narrated Abu Musa:

came to the Prophet (from Yemen and was assuming Ihram for Hajj) and he ordered me to finish the Ihram (after performing the 'Umra).

Bukhari :: Book 2 :: Volume 26 :: Hadith 637
Narrated Ibn 'Umar:

Hafsa the wife of the Prophet said, "O Allah's Apostle! Why have the people finished their Ihram after performing 'Umra but you have not finished your Ihram after performing 'Umra?" He replied, "I have matted my hair and garlanded my Hadi. So I will not finish my Ihram till I have slaughtered (my Hadi). "