Someone asked, "Messenger of Allah, what is the taking of omens?"He replied, "There is no omen," saying it three times. Then he said, "The best kind of good sign is a pleasant word."
وبهذا الإسناد قال قيل يا رسول الله ما الطيرة قال لا طائر ثلاث مرات وقال خير الفأل الكلمة الطيبة
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Its isnad is sahih. Bukhari related it in 7/175, in the Book of Medicine, chapter on omens, and Muslim in 4/1745, no. 2223, in the Book of Greetings, chapter on omens and good omen.