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بِسْمِ اللَّهِ وَلَجْنَا, وَبِسْمِ اللَّهِ خَرَجْنَا, وَعَلَى اللَّهِ رَبِّنَا تَوَكَّلْنَا, ثُمَّ لِيُسَلِّمْ عَلَى أَهْلِهِ
(In the name of Allah we enter and in the name of Allah we leave, and upon our Lord we place our trust.)
Source: Abu Dawud 4/325.