بِسْمِ اللَّهِ وَلَجْنَا، وَبِسْمِ اللَّهِ خَرَجْنَا، وَعَلَى اللَّهِ رَبِّنَا تَوَكَّلْنَا
Transliteration
Bismillahi walajna, wa bismillahi kharajna, wa 'alallahi Rabbina tawakkalna
English meaning
In the name of Allah we enter, in the name of Allah we leave, and upon our Lord we rely.
When is it recited?
When entering the house.
Source
Abu Dawud, Adab 102