Sahih al-Bukhari 1812
Sahih al-Bukhari · Book 27: Pilgrims Prevented from Completing the Pilgrimage · The slaughtering before shaving the head (in case) one is prevented
Narrated Nafi`:
حَدَّثَنَا مُحَمَّدُ بْنُ عَبْدِ الرَّحِيمِ ، أَخْبَرَنَا أَبُو بَدْرٍ، شُجَاعُ بْنُ الْوَلِيدِ عَنْ عُمَرَ بْنِ مُحَمَّدٍ الْعُمَرِيِّ ، قَالَ وَحَدَّثَ نَافِعٌ ، أَنَّ عَبْدَ اللَّهِ ، وَسَالِمًا ، كَلَّمَا عَبْدَ اللَّهِ بْنَ عُمَرَ ـ رضى الله عنهما ـ فَقَالَ خَرَجْنَا مَعَ النَّبِيِّ صلى الله عليه وسلم مُعْتَمِرِينَ، فَحَالَ كُفَّارُ قُرَيْشٍ دُونَ الْبَيْتِ، فَنَحَرَ رَسُولُ اللَّهِ صلى الله عليه وسلم بُدْنَهُ، وَحَلَقَ رَأْسَهُ.
That `Abdullah and Salim said to `Abdullah bin `Umar, "(You should not go for Hajj this year)." `Abdullah bin `Umar replied, "We set out with the Prophet (to Mecca for performing `Umra) and the infidels of Quraish prevented us from reaching the Ka`ba. Allah's Messenger (ﷺ) slaughtered his Budn (camels for sacrifice) and got his head shaved."