`Abdullah bin `Abdullah bin `Umar and his riding animal entered the house of Ibn `Umar. He (the son of Ibn `Umar) said, "I fear that this year a battle might take place between the people and you might be prevented from going to the Ka`ba. I suggest that you should stay here." Ibn `Umar said, "Once Allah's Messenger (ﷺ) set out for the pilgrimage, and the pagans of Quraish intervened between him and the Ka`ba. So, if the people intervened between me and the Ka`ba, I would do the same as Allah's Messenger (ﷺ) had done . . . "Verily, in Allah's Messenger (ﷺ) you have a good example." Then he added, "I make you a witness that I have intended to perform Hajj along with `Umra." After arriving at Mecca, Ibn `Umar performed one Tawaf only (between Safa and Marwa).
Sahih al-Bukhari Book 25, Hadith 122
← Previous Hadith We set out with Allah's Messenger (ﷺ) in the year of his Last Hajj and we mended (the Ihram) for `Umra. Then the Prophet (ﷺ) said, "Whoever has a Hadi with him should assume Ihram for both Hajj and `Umra, and should not finish it till he performs both of the them (Hajj and `Umra)." When we reached Mecca, I had my menses. When we had performed our Hajj, the Prophet (ﷺ) sent me with `Abdur-Rahman to Tan`im and I performed the `Umra. The Prophet (ﷺ) said, "This is in lieu of your missed `Umra." Those who had assumed Ihram for `Umra performed Tawaf (between Safa and Marwa) and then finished their Ihram. And then they performed another Tawaf (between Safa and Marwa) after returning from Mina. And those who had assumed lhram for Hajj and `Umra to get her ( Hajj-Qiran ) performed only one Tawaf (between Safa and Marwa).

Sahih al-Bukhari Book 25, Hadith 121 Next Hadith → Ibn `Umar intended to perform Hajj in the year when Al-Hajjaj attacked Ibn Az-Zubair. Somebody said to Ibn `Umar, "There is a danger of an impending war between them." Ibn `Umar said, "Verily, in Allah's Messenger (ﷺ) you have a good example. (And if it happened as you say) then I would do the same as Allah's Messenger (ﷺ) had done. I make you witness that I have decided to perform `Umra." Then he set out and when he reached Al-Baida', he said, "The ceremonies of both Hajj and `Umra are similar. I make you witness that I have made Hajj compulsory for me along with `Umra." He drove (to Mecca) a Hadi which he had bought from (a place called) Qudaid and did not do more than that. He did not slaughter the Hadi or finish his Ihram, or shave or cut short his hair till the day of slaughtering the sacrifices (10th Dhul-Hijja). Then he slaughtered his Hadi and shaved his head and considered the first Tawaf (of Safa and Marwa) as sufficient for Hajj and `Umra. Ibn `Umar said, "Allah's Messenger (ﷺ) did the same."

Sahih al-Bukhari Book 25, Hadith 123