It is narrated from Sayyiduna Uthman (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Whoever among the Muslims, when leaving his house—whether intending to travel or otherwise—recites this supplication «بسم الله آمنت بالله ، اعتصمت بالله ، توكلت على الله لاحول ولاقوة الا بالله», then goodness will be granted to him and he will be protected from the evil of his going out."
Hadith Referenceمسند احمد / مسند الخلفاء الراشدين / 471
Hadith Gradingحکم دارالسلام:إسناده ضعيف لجهالة الرجل الذى روى عنه صالح بن كيسان