The promised son Isaac is finally born! In joy, Abraham and Sarah laugh over the amazement of their situation. And when the boy is old enough to be weaned, Abraham gives a feast in his honor! However, Ishmael, Abraham's son by Hagar, is displeased, causing strife between Sarah and Ishmael, leading to Hagar and her son being sent away. But, even in their exile, God would not abandon them.