Urwah bin Amir (may Allah be pleased with him) said: Evil omens were mentioned in the presence of the Prophet (peace and blessings be upon him), and he said: "The good omen (fal) is the best of it, and it does not turn a Muslim back (from his purpose). When you see something from evil omens that you dislike, say: 'Allahumma la ya'ti bil-hasanati illa anta, wa la yadfa'u al-sayyi'ati illa anta, wa la hawla wa la quwwata illa bik' (O Allah, none brings good things except You, and none averts evil things except You, and there is no power (to avoid sins) and no strength (to do good) except through Your help)."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب القسامة / 16521