Musnad Abu Ya'la al-Mawsili 114:4

Muhammad ibn Abd al-Rahman ibn Sahm al-Antaki narrated to us, he said: I heard Abu Ishaq al-Fazari narrating from Hisham al-Qardusi, from Muhammad ibn Sirin, from Anas ibn Malik, who said: The Messenger of Allah (may Allah bless him and grant him peace) threw the pebbles at the Jamrah on the Day of Sacrifice (Yawm al-Nahr), then he ordered the sacrificial camels, and they were slaughtered. The barber was sitting beside him, and the Messenger of Allah (may Allah bless him and grant him peace) smoothed his hair that day with his hand. Then the Messenger of Allah (may Allah bless him and grant him peace) grasped the right side of his hair and said to the barber: "Shave." So he shaved it. The Messenger of Allah (may Allah bless him and grant him peace) then distributed his hair that day among those who were present of the people, a hair or two. Then he grasped with his hand the left side of his hair and said to the barber: "Shave." So he shaved it, and he called Abu Talhah al-Ansari and gave it to him.