Sahih al-Bukhari 1806
Book 27: Pilgrims Prevented from Completing the Pilgrimage · Narrated by Nafi`
Arabic
حَدَّثَنَا عَبْدُ اللَّهِ بْنُ يُوسُفَ، أَخْبَرَنَا مَالِكٌ، عَنْ نَافِعٍ، أَنَّ عَبْدَ اللَّهِ بْنَ عُمَرَ ـ رضى الله عنهما ـ حِينَ خَرَجَ إِلَى مَكَّةَ مُعْتَمِرًا فِي الْفِتْنَةِ قَالَ إِنْ صُدِدْتُ عَنِ الْبَيْتِ صَنَعْتُ 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.
English translation
Narrated Nafi`:When `Abdullah bin `Umar set out for Mecca intending to perform Umra, at the time of afflictions, he said, "If I should be prevented from reaching the Ka`ba, then I would do the same as Allah's Messenger (ﷺ) did, so I assume the Ihram for Umra as Allah's Messenger (ﷺ) assumed the Ihram for Umra in the year of Hudaibiya
Reference: Sahih al-Bukhari 1806, Book of Pilgrims Prevented from Completing the Pilgrimage. English translation by Dr. Muhammad Muhsin Khan.