It is narrated from Sayyiduna al-Sa'ib bin Yazid (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "There is no disease that is contagious by itself, there is no reality to Safar (an ill omen in the month of Safar), and there is no reality to the hamah (the owl that roams about)."
Hadith Referenceالمعجم الكبير للطبراني / باب السين / 6627