God has preserved Abraham and Isaac through Egypt and Gerar, famine and war, Sodom and destruction, pledging to keep His promise that a son would be born to him by Sarah. That day has come, and because Abraham would be the father of a multitude of faithful nations, this is a momentous event for all people. The story of Isaac and Ishmael not just about two brothers, but two covenants, two ways of life, two opposite approaches to serving God.