Musnad Abu Ya'la al-Mawsili 117:114

Harun narrated to us, Abu Dawud al-Tayalisi narrated to us, from al-Hakam ibn Atiyyah, from Thabit, from Anas, who said: "I truly hope that I will meet the Messenger of Allah, may Allah bless him and grant him peace, on the Day of Resurrection, and I will say: 'O Messenger of Allah, your little servant.'"