Musnad Abu Ya'la al-Mawsili 115:160

Abu Musa narrated to us, Abu Dawud narrated to us, Shu'bah narrated to us, from Qatadah, who said: I heard Anas bin Malik say: The Messenger of Allah (peace and blessings of Allah be upon him) said: The like of it, except that he said: He finds the sweetness of faith through them.