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(بِسْمِ اللَّهِ وَلَجْنَا، وَبِسْمِ اللَّهِ خَرَجْنَا، وَعَلَى اللَّهِ رَبِّنَا تَوَكَّلْنَا، ثُمَّ لِيُسَلِّمْ عَلَى أَهْلِهِ).
Bismil-lahi walajna, wabismil-lahi kharajna, waAAala rabbina tawakkalna.
In the name of Allah we enter and in the name of Allah we leave, and upon our Lord we place our trust.
Source
Hisn al-Muslim, no. 18