Abu Dawud Book 28, Hadith Number 4169.

Chapter : Use of khaluq by men.

Narated By Al-Walid ibn Uqbah : When the Prophet of Allah (PBUH) conquered Makkah. The people of Makkah began to bring their boys and he would invoke a blessing on them and rub their heads. I was brought, but as I had been perfumed with khaluq, he did not touch me because of the khaluq.