It is narrated from Sayyiduna Abu Umamah (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "There is nothing in the hamah (the pre-Islamic superstition about a spirit emerging in the form of an owl), the evil eye is real, and the truest of omens is a good omen (fa'l)."
Hadith Referenceالمعجم الكبير للطبراني / باب الصاد / 7655