أَسْتَوْدِعُ اللَّهَ دِينَكَ وَأَمَانَتَكَ وَخَوَاتِيمَ عَمَلِكَ
Astawdi'ullaha dinaka wa amanataka wa khawatima 'amalik
I entrust to Allah your religion, your trusts, and the conclusions of your deeds.
The Prophet ﷺ would say this when seeing someone off on a journey. Three things entrusted: your deen (religion — travel can weaken religious practice), your amanah (trusts — responsibilities to family and others), and your khawatim (endings of deeds — the last deed determines your outcome). It is a farewell that covers both worlds — your worldly responsibilities and your spiritual safety.
Related Du'as
تَوْبًا تَوْبًا لِرَبِّنَا أَوْبًا لَا يُغَادِرُ عَلَيْنَا حَوْبًا
Repentance, repentance to our Lord — a return that leaves no sin upon us.
Hasanسُبْحَانَ الَّذِي سَخَّرَ لَنَا هَٰذَا وَمَا كُنَّا لَهُ مُقْرِنِينَ وَإِنَّا إِلَىٰ رَبِّنَا لَمُنقَلِبُونَ
Glory to the One who has subjected this for us, and we could never have it by our own efforts. And indeed, to our Lord we will surely return.
Sahihاللَّهُمَّ هَوِّنْ عَلَيْنَا سَفَرَنَا هَذَا وَاطْوِ عَنَّا بُعْدَهُ
O Allah, make this journey easy for us, and fold up its distance for us.
Sahihاللَّهُمَّ لَيِّنْ لَنَا أَرْضَكَ وَذَلِّلْ لَنَا صُعُوبَتَهَا
O Allah, soften Your earth for us and ease its difficulties.
Hasan