Sayyiduna Anas (may Allah be pleased with him) said that the Prophet (peace and blessings be upon him) said: "There is no contagion (of disease by itself), and there is no basis to taking evil omens from birds, and I like the good omen (fal): the good word."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب القسامة / 16520