Musnad Abu Ya'la al-Mawsili 117:95

Abu al-Rabi' narrated to us, al-Harith bin 'Ubayd narrated to us, from Thabit, from Anas, who said: They said, "O Messenger of Allah, we are in one state when we are with you, but when we depart from you, we are in another." He said, "How are you and your Prophet?" They said, "You are our Prophet in secret and in public." He said, "That is not hypocrisy."