Genesis 13:17

Arise, walk through the land in the length of it and in the breadth of it; for I will give it unto thee. This refers to an ancient custom according to which a person signified his claim to a piece of ground by walking around it. Though Abram did not possess so much as one foot of land, yet God's promise stood that his descendants should occupy the entire country as their own. All this has a wider significance. For, as one commentator has it, through Christ the promise is elevated out of its temporal form to the dignity of substance; through Him the whole world becomes a Canaan. To the numberless seed of Abram belong all men from all generations of the earth that hold the faith of Abram, or Abraham. Abraham is the father of us all, Romans 4:16. We that believe the promise concerning Christ belongs to that great people of believers which has existed since the time of Adam and has its representatives in all nations of the earth.