Abu Hurayrah (may Allah be pleased with him) said: I heard the Prophet (peace and blessings be upon him) say: "There is no (truth in) evil omens from birds, and better than that is the good omen (fal)." It was asked: "What is the good omen?" He (peace and blessings be upon him) said: "A good word that one may hear."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب القسامة / 16518