Hajj after Muhammads death.
Sahih Al Bukhari 2.704: Bk 25.123
Narrated Nafi`: 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 Apostle you have a good example. (And if it happened as you say) then I would do the same as Allah's Apostle 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...