Sahih al-Bukhari, Book 25, Hadith 212 (In-Book) ⓘ
Narrated Ibn `Abbas: The Prophet 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."
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 " .
also referenced under: Hadith 1734 (DarusSalam) & Volume 2, Book 26, Hadith 790 (USC-MSA)