Sahih al-Bukhari, Book 64, Hadith 223 (In-Book) ⓘ
Narrated Nafi`: `Abdullah bin `Umar set out for Umra during the period of afflictions, and he said, "If I should be stopped from visiting the Ka`ba, I will do what we did when we were with Allah's Messenger." He assumed Ihram for `Umra in the year of Al-Hudaibiya.
حَدَّثَنَا قُتَيْبَةُ، عَنْ مَالِكٍ، عَنْ نَافِعٍ، أَنَّ عَبْدَ اللَّهِ بْنَ عُمَرَ ـ رضى الله عنهما ـ خَرَجَ مُعْتَمِرًا فِي الْفِتْنَةِ فَقَالَ إِنْ صُدِدْتُ عَنِ الْبَيْتِ، صَنَعْنَا كَمَا صَنَعْنَا مَعَ رَسُولِ اللَّهِ صلى الله عليه وسلم. فَأَهَلَّ بِعُمْرَةٍ مِنْ أَجْلِ أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم كَانَ أَهَلَّ بِعُمْرَةٍ عَامَ الْحُدَيْبِيَةِ.
also referenced under: Hadith 4183 (DarusSalam) & Volume 5, Book 59, Hadith 497 (USC-MSA)