Musnad Abu Ya'la al-Mawsili 146:1

Abu Bakr ibn Abi Shaybah narrated to us, Ubayd ibn Sa'id al-Qurashi narrated to us, Shu'bah narrated to us, from Abu al-Tayyah, who said: I heard Anas ibn Malik saying: The Prophet, may Allah bless him and grant him peace, said: "Make things easy and do not make them difficult, and give glad tidings and do not cause aversion."