Musnad Abu Ya'la al-Mawsili 117:197

Abu Abd al-Rahman al-Adhrami narrated to us, Abu Qatan narrated to us, Mubarak narrated to us, from Thabit, from Anas, who said: I never saw a man ever take the ear of the Messenger of Allah (may Allah bless him and grant him peace) into his mouth, except that he (the Prophet) would not turn his head away until the man turned his head away. And I never saw anyone ever take the hand of the Messenger of Allah (may Allah bless him and grant him peace), except that he (the Prophet) would not leave his hand until the man was the one who left his hand. And I never touched anything softer than the skin of the Messenger of Allah (may Allah bless him and grant him peace), and I never found a scent better than the scent of the Messenger of Allah (may Allah bless him and grant him peace).