John Wesley on Genesis 13:18

Then Abram removed his tent - God bid him walk through the land, that is, Do not think of fixing in it, but expect to be always unsettled, and walking through it to a better Canaan; in compliance with God's will herein, he removed his tent, conforming himself to the condition of a pilgrim. And he built there an altar - in token of his thankfulness to God for the kind visit he had made him.