Sahih al-Bukhari 124
صحيح البخاري#124Sahihحَدَّثَنَا أَبُو نُعَيْمٍ، قَالَ حَدَّثَنَا عَبْدُ الْعَزِيزِ بْنُ أَبِي سَلَمَةَ، عَنِ الزُّهْرِيِّ، عَنْ عِيسَى بْنِ طَلْحَةَ، عَنْ عَبْدِ اللَّهِ بْنِ عَمْرٍو، قَالَ رَأَيْتُ النَّبِيَّ صلى الله عليه وسلم عِنْدَ الْجَمْرَةِ وَهُوَ يُسْأَلُ، فَقَالَ رَجُلٌ يَا رَسُولَ اللَّهِ نَحَرْتُ قَبْلَ أَنْ أَرْمِيَ. قَالَ " ارْمِ وَلاَ حَرَجَ ". قَالَ آخَرُ يَا رَسُولَ اللَّهِ حَلَقْتُ قَبْلَ أَنْ أَنْحَرَ. قَالَ " انْحَرْ وَلاَ حَرَجَ ". فَمَا سُئِلَ عَنْ شَىْءٍ قُدِّمَ وَلاَ أُخِّرَ إِلاَّ قَالَ افْعَلْ وَلاَ حَرَجَ.
Narrated `Abdullah bin `Ammar:I saw the Prophet (ﷺ) near the Jamra and the people were asking him questions (about religious problems). A man asked, "O Allah's Messenger (ﷺ)! I have slaughtered the Hadi (animal) before doing the Rami." The Prophet (ﷺ) replied, "Do the Rami (now) and there is no harm." Another person asked, "O Allah's Messenger (ﷺ)! I got my head shaved before slaughtering the animal." The Prophet (ﷺ) replied, "Do the slaughtering (now) and there is no harm." So on that day, when the Prophet (ﷺ) was asked about anything as regards the ceremonies of Hajj performed before or after its due time his reply was, "Do it (now) and there is no harm
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
Every narration in Sahih al-Bukhari is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 3:66