Sahih al-Bukhari 3832
صحيح البخاري#3832SahihNarrated Ibn `Abbas:The people used to consider the performance of `Umra in the months of Hajj an evil deed on the earth, and they used to call the month of Muharram as Safar and used to say, "When (the wounds over) the backs (of the camels) have healed and the foot-marks (of the camels) have vanished (after coming from Hajj), then `Umra becomes legal for the one who wants to perform `Umra." Allah's Messenger (ﷺ) and his companions reached Mecca assuming Ihram for Hajj on the fourth of Dhul-Hijja. The Prophet (ﷺ) ordered his companions to perform `Umra (with that Ihram instead of Hajj). They asked, "O Allah's Apostle! What kind of finishing of Ihram?" The Prophet (ﷺ) said, "Finish the Ihram completely
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Every narration in Sahih al-Bukhari is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 63:57