Sahih al-Bukhari 1734
Sahih al-Bukhari · Book 25: Hajj (Pilgrimage) · Rami of the Jamra after Maghrib or head shaved before slaughtering the Hadi
Narrated Ibn `Abbas:
حَدَّثَنَا مُوسَى بْنُ إِسْمَاعِيلَ ، حَدَّثَنَا وُهَيْبٌ ، حَدَّثَنَا ابْنُ طَاوُسٍ ، عَنْ أَبِيهِ ، عَنِ ابْنِ عَبَّاسٍ ـ رضى الله عنهما ـ أَنَّ النَّبِيَّ صلى الله عليه وسلم قِيلَ لَهُ فِي الذَّبْحِ وَالْحَلْقِ وَالرَّمْىِ وَالتَّقْدِيمِ وَالتَّأْخِيرِ فَقَالَ " لاَ حَرَجَ " .
The Prophet (ﷺ) was asked about the slaughtering, shaving (of the head), and the doing of Rami before or after the due times. He said, "There is no harm in that."