Hadith 887B1

قَالَ مَالِك : لَا يَجُوزُ لِأَحَدٍ أَنْ يَحْلِقَ رَأْسَهُ حَتَّى يَنْحَرَ هَدْيَهُ، وَلَا يَنْبَغِي لِأَحَدٍ أَنْ يَنْحَرَ قَبْلَ الْفَجْرِ يَوْمَ النَّحْرِ، وَإِنَّمَا الْعَمَلُ كُلُّهُ يَوْمَ النَّحْرِ الذَّبْحُ وَلُبْسُ الثِّيَابِ، وَإِلْقَاءُ التَّفَثِ وَالْحِلَاقُ لَا يَكُونُ شَيْءٌ مِنْ ذَلِكَ يُفْعَلُ قَبْلَ يَوْمِ النَّحْرِ
Imam Malik, may Allah have mercy on him, said that it is not permissible for anyone to shave his head before the sacrifice of the Hady, nor is it permissible to perform the sacrifice before the dawn of the Day of Sacrifice. Rather, the sacrifice, changing of clothes, removal of dirt, and shaving of the head—all these actions should be done on the tenth day; before that, they are not permissible.
Hadith Reference موطا امام مالك رواية يحييٰ / كتاب الحج / 887B1
Hadith Takhrij «فواد عبدالباقي نمبر: 20 - كِتَابُ الْحَجِّ-ح: 183»