Musnad Abu Ya'la al-Mawsili 148:49

Abu al-Jahm al-Azraq ibn Ali narrated to us, Yahya ibn Abi Bukayr narrated to us, al-Hasan ibn Salih narrated to us, from Jabir al-Ju'fi, from Ziyad al-Numayri, from Anas ibn Malik, who said: The Messenger of Allah (may Allah bless him and grant him peace) came to a tree and shook it until its leaves fell as much as Allah willed for them to fall. Then he said: "Ailments and calamities are faster at [removing] the sins of the son of Adam than I am at [shaking] this tree."