Sahih Bukhari Volume 2, Book 25, Hadith 1694

حَدَّثَنَا أَبُو النُّعْمَانِ، حَدَّثَنَا حَمَّادٌ، عَنْ أَيُّوبَ، عَنْ نَافِعٍ، قَالَ قَالَ عَبْدُ اللَّهِ بْنُ عَبْدِ اللَّهِ بْنِ عُمَرَ ـ رضى الله عنهم ـ لأَبِيهِ أَقِمْ، فَإِنِّي لاَ آمَنُهَا أَنْ سَتُصَدُّ عَنِ الْبَيْتِ‏.‏ قَالَ إِذًا أَفْعَلَ كَمَا فَعَلَ رَسُولُ اللَّهِ صلى الله عليه وسلم وَقَدْ قَالَ اللَّهُ ‏{‏لَقَدْ كَانَ لَكُمْ فِي رَسُولِ اللَّهِ أُسْوَةٌ حَسَنَةٌ‏}‏ فَأَنَا أُشْهِدُكُمْ أَنِّي قَدْ أَوْجَبْتُ عَلَى نَفْسِي الْعُمْرَةَ‏.‏ فَأَهَلَّ بِالْعُمْرَةِ، قَالَ ثُمَّ خَرَجَ حَتَّى إِذَا كَانَ بِالْبَيْدَاءِ أَهَلَّ بِالْحَجِّ وَالْعُمْرَةِ، وَقَالَ مَا شَأْنُ الْحَجِّ وَالْعُمْرَةِ إِلاَّ وَاحِدٌ‏.‏ ثُمَّ اشْتَرَى الْهَدْىَ مِنْ قُدَيْدٍ، ثُمَّ قَدِمَ فَطَافَ لَهُمَا طَوَافًا وَاحِدًا، فَلَمْ يَحِلَّ حَتَّى حَلَّ مِنْهُمَا جَمِيعًا‏

Narrated By Nafi' : 'Abdullah (bin 'Abdullah) bin 'Umar said to his father, "Stay here, for I am afraid that it (affliction between Ibn Zubair and Al-Hajjaj) might prevent you from reaching the Ka'ba." Ibn 'Umar said, "(In this case) I would do the same as Allah's Apostle did, and Allah has said, 'Verily, in Allah's Apostle, you have a good example (to follow).' So, I make you, people, witness that I have made 'Umra compulsory for me." So he assumed Ihram for 'Umra. Then he went out and when he reached Al-Baida', he assumed Ihram for Hajj and 'Umra (together) and said, "The conditions (requisites) of Hajj and 'Umra are the same." He, then brought a Hadi from Qudaid. Then he arrived (at Mecca) and performed Tawaf (between Safa and Marwa) once for both Hajj and 'Umra and did not finish the Ihram till he had finished both Hajj and 'Umra.