Musnad Ahmad 32:383

Muhammad ibn Ja'far narrated to us, Shu'bah narrated to us, he said: I heard Qatadah narrating from Anas ibn Malik, from the Prophet, peace and blessings of Allah be upon him, that he said: "There is no contagion, and no superstition, but the *fa'l* (good omen) pleases me." It was said: "And what is the *fa'l*?" He said: "A good word."