You shall command the priests who bear the ark of the covenant, saying, When you are come to the brink of the waters of the Jordan, you shall stand still in the Jordan.
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.