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بِسْمِ اللَّهِ وَلَجْنَا، وَبِسْمِ اللَّهِ خَرَجْنَا، وَعَلَى اللَّهِ رَبِّنَا تَوَكَّلْنَا
Bismillahi walajna, wabismillahi kharajna, wa'alallahi rabbina tawakkalna
In the name of Allah we enter, in the name of Allah we leave, and upon Allah, our Lord, we place our trust.
Source Sunan Abī Dāwūd 5096 (similar wording) Ḍaʿīf · Ṣaḥīḥ Muslim, The Book of Drinks — site no. 5125 Ṣaḥīḥ
Compiler cites Abū Dāwūd no. 5096, with a ḥasan chain (compiler); see also Muslim no. 2018