Behold, the ark of the covenant of the Lord of all the earth passes over before you into 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.