أَسْتَـوْدِعُكُـمُ اللَّهَ الَّذي لا تَضـيعُ وَدائِعُـه
Astawdi ukumul-laahal-lathee laa tadhee u wadaa i uhu.
I leave you in the care of Allah, as nothing is lost that is in His care.
Reference: Ahmad 2/403, Ibn Majah 2/943. See also Al-Albani, Sahih Ibn Majah 2/133.