Read this dua when you send someone on a journey.
I leave your religion in the care of Allah, as well as your safety, and the last of your deeds.
أَسْتَـوْدِعُ اللَّهَ دِيـنَكَ وَأَمانَتَـكَ، وَخَـواتيـمَ عَمَـلِكَ
‘Astawdi’ullaaha deenaka, wa ‘amaanataka, wa khawaateema ‘amalika.
Ahmad 2/7, At-Tirmidhi 5/499. See also Al-Albani, Sahih At-Tirmidhi