It shall come to pass, when the soles of the feet of the priests who bear the ark of Yahweh, the Lord of all the earth, shall rest in the waters of the Jordan, that the waters of the Jordan shall be cut off, even the waters that come down from above; and they shall stand in one heap.
Evidently the pushing back of the waters of the Jordan was to be a sign to the Israelites that God would push back the Canaanites (Joshua 3:10). The title "the Lord of all the earth" occurs here (Joshua 3:11) first in Scripture indicating Yahweh’s absolute sovereignty over this planet. Because He was "the Lord of all the earth" He could give Canaan to the Israelites.