(3) باب النَّحْرِ قَبْلَ الْحَلْقِ فِي الْحَصْرِ
Narrated Al-Miswar:
Allah's Messenger (ﷺ) slaughtered (the Hadi) before he had his head shaved and then he ordered his Companions to do the same. (ID)
Reference (ID): Sahih al-Bukhari 1811 (ID)
In-book reference (ID): Book 27, Hadith 6 (ID)
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 3, Book 28, Hadith 38 (ID)