Adam Clarke on Numbers 14:21

All the earth shall be filled, etc. - כל הארץ kol haarets, all This land, i. e., the land of Canaan which was only fulfilled to the letter when the preaching of Christ and his apostles was heard through all the cities and villages of Judea. It does not appear that the whole of the terraqueous globe is meant by this expression in any of the places where it occurs connected with this promise of the diffusion of the Divine light. See Psa 72:19; Isa 40:5; Hab 2:14.