Invocation for Leaving the Mosque

"بِسْمِ اللهِ، وَالصَّلَاةُ وَالسَّلَّامُ عَلَى رَسُولِ اللهِ، اللَّهُمَّ إَنِّي أَسْأَلُكَ مِنْ فَضْلِكَ، اللَّهُمَّ اعصِمْنِي مِنَ الشَّيْطَانِ الرَّجِيمِ".

21. 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.

reference: ibid.