Musnad Ahmad 32:393

Muhammad ibn Ja'far narrated to us, Shu'bah narrated to us, and Hajjaj said: Shu'bah informed us, and Hashim, Shu'bah narrated to us, he said: Abu al-Tayyah said: And I heard Anas ibn Malik saying: The Messenger of Allah, peace and blessings of Allah be upon him, said: "Make things easy and do not make them difficult, and give glad tidings and do not cause aversion."