أَسْتَـوْدِعُ اللَّهَ ديـنَكَ وَأَمانَتَـكَ، وَخَـواتيـمَ عَمَـلِك
Astawdi ullaaha deenaka, wa amaanataka, wa khawaateema amalika.
I leave your religion in the care of Allah, as well as your safety, and the last of your deeds.
Reference: Ahmad 2/7, At-Tirmithi 5/499. See also Al-Albani, Sahih At-Tirmithi 2/155.