Genesis 17:1 - The Popular Commentary by Paul E. Kretzmann

And when Abram was ninety years old and nine, the Lord appeared to Abram and said unto him, I am the almighty God; walk before me and be thou perfect. Twenty-four years Abram had now been a stranger in Canaan, thirteen years had elapsed since the birth of Ishmael, and still the patience of Abram and Sarai was sorely tried, still no child came to gladden their hearts. But the Lord now appeared to Abram once more, calling Himself the almighty God, and bidding His servant walk before Him, lead his entire life so as to be without reproach. Every one that is justified by faith will so conduct himself in his entire life and actions as to give all honor to God and to place all trust in Him, even if He should delay in the fulfillment of some promise.