The traveler's invocation for the one he leaves behind

 

211. '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.