Combing the Hair (Kitab Al-Tarajjul)
Dawud :: Book 33 : Hadith 4153
Narrated Aisha, Ummul Mu'minin:
When Hind, daughter of Utbah, said: Prophet of Allah, accept my allegiance, he replied; I shall not accept your allegiance till you make a difference to the palms of your hands; for they look like the paws of a beast of prey.