Fortress of the Muslim (Hisn al-Muslim)
حصن المسلم
(10) Chapter: Remembrance when leaving the home
(10) الذكر عند الخروج من المنزل
Hisn al-Muslim 16 
Bismillāhi, tawakkaltu `alallāhi, wa lā ḥawla wa lā quwwata illā billāh. In the Name of Allah, I have placed my trust in Allah, there is no might and no power except by Allah. Reference: Abu Dawud 4/325, At-Tirmidhi 5/490. See also Al-Albani, Sahih At-Tirmidhi 3/151
بِسْمِ اللهِ ، تَوَكَّلْـتُ عَلى اللهِ وَلا حَوْلَ وَلا قُـوَّةَ إِلاّ بِالله
Reference : Hisn al-Muslim 16