Musnad Abu Ya'la al-Mawsili 2:14

Abu Khaythama Zuhayr ibn Harb and Ubayd Allah ibn Umar al-Qawariri narrated to us, they said: Sufyan narrated to us, from al-Zuhri, from Ubayd Allah ibn Abd Allah, from Ibn Abbas, from Umar, from the Prophet, may Allah bless him and grant him peace, who said: "Do not exaggerate in praising me as the Christians exaggerated in praising Isa ibn Maryam, but say: The servant of Allah and His Messenger."