It is narrated from Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "Taking evil omens is part of shirk, and there is none of us (in whose heart something of it does not occur), but Allah Almighty removes it through reliance (on Him)." The chain of this hadith is sahih and its narrators are trustworthy, but the two of them (Imam Bukhari and Muslim) did not narrate it. Isa bin Asim al-Asadi also took narrations from Adiyy bin Thabit and others, and Shu'bah, Jarir bin Hazim, Mu'awiyah bin Salih and others narrated from him.