The Messenger of Allah ﷺ said, "There is no contagion, no evil omen from owls, no influence of stars on rainfall, and no ill omen in the month of Safar."
أن رسول الله ﷺ قال: لا عدوى، ولا هامة، ولا نوء، ولا صفر.
Muslim reported it in "Salam" (2220) through multiple routes from Ismail bin Jafar, from Ala, from his father, from Abu Hurairah, who narrated it.