Abraham makes the leap and thus secures his reputation for all time. The text is so matter-of-fact it almost masks the significance: ‘Abram went forth as the Lord had commanded him’.  He does so silently, joining the covenant with his feet, not his words.  The wandering man does what he does best, he walks.  Only now he walks with God.  And by doing so, Abraham leaves an indelible set of footprints.  He doesn’t believe in God; he believes God.  He doesn’t ask for proof; he provides the proof.

Source: Feiler, Bruce.  Abraham: A Journey to the Heart of Three Faiths.  Perennial: New York, 2004.