Musnad Abu Ya'la al-Mawsili 3:99

Abu Khaythama narrated to us, Abd al-Samad ibn al-Warith narrated to us, Shu'bah narrated to us, Fudayl narrated to us, from Abu Hariz, from al-Sha'bi, from Ali, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said when he returned from a funeral: "Say a word that I would not love to have the entire world in exchange for."