Where does “fore-” come from?

fore- (Old Frisian) comes from Proto-Germanic furai-, from Proto-Germanic furai, from Proto-Indo-European preh₂-, from Proto-Indo-European per-, from Proto-Indo-European pr̥tós — passed , crossed.

Ancestry of “fore-”, step by step

Step	Language	Word	Meaning
1	Proto-Germanic	furai-	before, in front of; fore-, pre-
2	Proto-Germanic	furai	before, in front of; before, in front
3	Proto-Indo-European	preh₂-	before, in front
4	Proto-Indo-European	per-	before, in front; first; to go through
5	Proto-Indo-European	pr̥tós	passed , crossed

Words derived from “fore-”

foar-

Every word from Proto-Indo-European pr̥tós →Every word from Proto-Indo-European per- →Every word from Proto-Indo-European preh₂- →