godspeed
From Longman Dictionary of Contemporary Englishgodspeedgod‧speed, Godspeed /ˌɡɒdˈspiːd $ ˈɡɑːdspiːd, ˌɡɑːdˈspiːd/ noun [uncountable] spoken old useLUCKY used to wish someone good luck, especially before a journeyOrigin godspeed (1400-1500) God speed you “may God give you success”