Godspeed

wiktionary

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From Middle English phrase God spede(“may God cause you to succeed”), from God(“God”) + spede, singular subjunctive of spedan(“to prosper”), from Old English spēdan, from spēd(“success”) (see English speed).

etymonline

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godspeed (interj.)

also God speed, by late 14c., "(I wish that) God (may) grant you success," from God + speed (v.) in its old sense of "prosper, grow rich, succeed." Specifically as a salutation by mid-15c. Also in Middle English as an adverb, "quickly, speedily" (early 14c.); the then-identically spelled God and good seem to be mixed up in this word. From late 13c. as a surname. He may bidde god me spede is found in a text from c. 1300.