Hisnul Muslim 21

Upon leaving the mosque

بِسْمِ اللّهِ وَالصَّلاَةُ وَالسَّلاَمُ عَلَى رَسُولِ اللّهِ، اَللَّهُـمَّ إِنِّي أَسْأَلُكَ مِنْ فَضْـلِكَ، اَللَّهُـمَّ اعْصِمْنِـي مِنَ الشَّيْـطَانِ الرَّجِـيمِ

Bismillaahi wassalaatu wassalaamu 'alaa Rasoolillaahi, Allaahumma 'innee 'as'aluka min fadhlika, Allaahumma'simnee minash-Shaytaanir-rajeem.

In the Name of Allah, and peace and blessings be upon the Messenger of Allah. O Allah, I ask for Your favor, O Allah, protect me from Satan the outcast.